May 8, 2022

UNIVERSITY EXAMINATIONS: 2013/2014 ORDINARY EXAMINATION FOR THE BACHELOR OF BUSINESS INFORMATION TECHNOLOGY BBIT 102 COMPUTER ORGANIZATION & ARCHITECTURE DATE: AUGUST, 2014 TIME: 2 HOURS INSTRUCTIONS: Answer Question ONE and any other TWO QUESTION ONE (i) Explain the meaning of the following acronyms as used in the computer systems: (i) POST (2 Marks) (ii) BIOS (2 Marks) (iii) VDU (2 Marks) (iv) BASIC (2 Marks) (v) FORTRAN (2 Marks) (vi) EEPROM (2 Marks) (vii) DIMMS (2 Marks) (ii) Discuss any two pointing devices, which can be used to input data into computers and state the appropriate areas of application. (4 marks) (c) Convert the binary number 1010111 to: (i) Octal (2 marks) (ii) Decimal (2 marks) (iii) Hexadecimal (2 marks) (d) Computer generations are five in all. Discuss the fifth generation. (6 marks) QUESTION TWO (a) With a well labelled diagram, explain all components and their devices found in Von Neumann computer architecture. (10 marks) (b) Explain the following terms and state how they affect system performance. i) Bus width (1 Mark) ii) Word size (1 Mark) (c) Briefly explain the boot-up process and state how you can troubleshoot if the process was not successful. (8 marks) QUESTION THREE (a) A LAN (Local Area Network) is often installed by a business to achieve either or both of the following objectives: (i) Sharing of peripherals (ii) Sharing of data By reference to a typical business explain each of the objectives. (8 marks) (b) Outline THREE possible problems of sharing data within a network.(6 marks) (c) (i) A magnetic tape has a minimum length and data recording density 160,000 bpi. Calculate its capacity. (3 marks) (ii) The above tape moves at 100 inches per second. Calculate its data transfer rate. (3 Marks) QUESTION FOUR (a) Define an operating system. Explain four functions of any operating system (6 marks) (b) Explain the difference between i) Application software and operating system ii) RAM and ROM (4 Marks) (c) Write short notes on the following: (i) Mainframe (ii) Minicomputers (iii) Microcomputers (iv)Super microcomputer (v) Laptop (10 Marks) QUESTION FIVE (a) ((i) What is network topology? (2 marks) (ii) Discuss two types of topologies that you know (4 marks) (b) Discuss batch processing. (4 marks) (c) Name 3 parts of a computer system that are capable of being upgraded and briefly explain steps of upgrading them. (6 marks) (d) Discuss any four output devices. (4 Marks)

UNIVERSITY EXAMINATIONS: 2013/2014 ORDINARY EXAMINATION FOR THE BACHELOR OF BUSINESS INFORMATION TECHNOLOGY BBIT 102 COMPUTER ORGANIZATION & ARCHITECTURE DATE: AUGUST, 2014 TIME: 2 HOURS INSTRUCTIONS: Answer Question ONE and any other TWO QUESTION ONE (a) Explain the meaning of the following terns as used in the computer systems: (i) Hardware (2 Marks) (ii) Software (2 Marks) (b) List any two pointing devices, which can be used to input data into computers and state the appropriate areas of application. (4 Marks) (c) Convert the decimal number 567 to: (i) Octal (2 Marks) (ii) Binary (2 Marks) (iii) Hexadecimal (2 Marks) (d) With a well labelled diagram, explain all components and their devices found in Von Neumann computer architecture. (10 Marks) (e) Computer generations are five in all. Discuss the fifth generation. (6 Marks) QUESTION TWO (a) The main role of the CPU is to execute instructions. Explain the steps involved during the execution of an instruction. (8 Marks) (b) Explain the following terms and state how they affect system performance. i) Bus width ii) Word size (2 Marks each) (c) Briefly explain the boot-up process and state how you can troubleshoot if the process was not successful. (8 Marks) QUESTION THREE By explaining each of the following terms distinguish between: (a) Smart card and a card with a magnetic stripe. (4 Marks) (b) MICR and OMR. (4 Marks) (c) Laser printers and Dot-matrix printers. (4 Marks) (d) Multiprogramming and Parallel Processing. (4 Marks) (e) Real time processing and On-line processing. (4 Marks) QUESTION FOUR (a) A LAN (Local Area Network) is often installed by a business to achieve either or both of the following objectives: (i) Sharing of peripherals (ii) Sharing of data By reference to a typical business explain each of the objectives. (8 Marks) (b) Outline THREE possible problems of sharing data within a network. (6 Marks) (c) Consider the following situation: A remote BACKUP Magnetic tape is capable of storing data. It has 12000 dpi and of maximum length. Required: What is the capacity of this magnetic tape? (6 Marks) QUESTION FIVE (a) Briefly explain what the following DOS commands do: (i) DIR *.TXT (2 Marks) (ii) COPY A:\*.EXE B: (2 Marks) (b) Describe how you Create a batch files of your choice. (4 Marks) (c) Name 3 parts of a computer system that are capable of being upgraded and briefly explain steps of upgrading them. (6 Marks) (d) (i) What is network topology? (2 Marks) (ii) Discuss two types of topologies that you know (4 Marks)

UNIVERSITY EXAMINATIONS: 2013/2014 ORDINARY EXAMINATION FOR THE BACHELOR OF BUSINESS INFORMATION TECHNOLOGY BBIT 102 COMPUTER ORGANISATION & ARCHITECTURE – DISTNCE LEARNING & WEEKEND DATE: AUGUST, 2014 TIME: 2 HOURS INSTRUCTIONS: Answer Question ONE and any other TWO QUESTION ONE [30 MARKS] a) Compare the characteristics of SIMD and MIMD. (4 marks) b) What is an instruction format? Discuss different types of instruction formats. (4 marks) c) Explain the stack-based architecture of a CPU with the help of a diagram. (3 marks) d) What is memory hierarchy? Why do we need it? (2 marks) e) State the characteristics of the RAM? (2 marks) f) Define a memory Cache? (2 marks) g) Define addressing modes. Classify and explain with examples. (3 marks) h) Multiply the following OCTAL numbers 7 and 6. (Show your working) (2 marks) i) State the function of the ROM BIOS. (2 marks) i) Write short notes on memory reference, (3 marks) j) A computer’s memory is composed of 8K words of 32 bits each. How many bits are required for memory address if the smallest addressable memory unit is a word? (3 mark) QUESTION TWO a) A computer’s memory is composed of 8K words of 32 bits each, and a byte is 8 bits. How many bytes does this memory contain? (2 marks) b) Which programming languages has an instruction set closest to the machine language of a computer? (2 marks) c) Distinguish between auto increment and auto decrement addressing mode. (2 marks) d) Compare RISC with CISC architecture. (8 marks) e) Define pipelining in microprocessor architecture and state its advantages? (6 marks) QUESTION THREE [20 MARKS] a) List the key aspects in gaining the performance in pipelined systems. (4 marks) b) How many memory chips are needed to construct 2 M × 16 memory system using 512 K × 8 static memory chips? (3 marks) c) What is virtual memory and state its benefits (4 marks) d) State the function of the address bus? (2 marks) e) Name and give the purpose of widely used bus standard. (3 marks) f) What are the TWO special registers in a typical computer and explain its functions. (4 Marks) QUESTION FOUR [20 MARKS] a) Describe the role of system software to improve the performance of a computer. (6 Marks) b) Draw and explain the block diagram of a complete processor. (6 Marks) c) What is the role of buffering in computer are system and give two example (4 Marks) d) Convert the hexadecimal number F2C to binary and decimal number systems. (4 marks) QUESTION FIVE [20 MARKS] a) Describe the role of cache memory in pipelined system. (6 Marks) b) What are the different secondary storage devices? Elaborate on any one of the devices. (4 Marks) c) What are the needs for input-output interface? (3 Marks) d) Explain how the virtual address is converted into real address in a paged virtual memory system. (4 Marks) e) Briefly describe magnetic disk principles and also the organization and accessing of data on a disk. (3 Marks)

UNIVERSITY EXAMINATIONS: 2014/2015 ORDINARY EXAMINATION FOR THE BACHELOR OF BUSINESS INFORMATION TECHNOLOGY BBIT 100 CMS 103 COMPUTER APPLICATIONS SOFTWARE – DISTANCE LEARNING DATE: DECEMBER, 2014 TIME: 2 HOURS INSTRUCTIONS: Answer Question ONE and any other TWO QUESTION ONE [30 MARKS] a) Distinguish between data, information and knowledge. [3 Marks] b) Define the term computer work station. [2 Marks] c) Identify and explain five potential health hazards associated with computer use. [5 Marks] d) Apart from a mouse, state any other four pointing devices and where you are most likely to use them. [8 Marks] e) Briefly outline any four security issues associated with electronic mail. [4 Marks] f) A computer aided drawing (CAD) is the use of computers to produce drawings that would normally be prepared manually. With the advent of CAD packages, traditional tools such as the compass, T-square, rule, pencils and erasers are being used less and less. From this view point, discuss four advantages of CAD software applications. [4 Marks] g) Multimedia is a collection of different forms of media combined together to provide good, effective communication. Multimedia can incorporate graphics, animation, sound and video. State and explain the use of any two multimedia software applications you know. [4 Marks] QUESTION TWO [20 MARKS] a) Social networking platforms today can allow organizations, big and small alike, to improve communication and productivity by disseminating information among different groups of employees in a more efficient manner. From this view point: i). Describe two advantages and two disadvantages of social networking [4 Marks] ii). Identify any two social networking sites [2 Marks] iii). Differentiate between social network and social media. [2 Marks] b) A virus is a malicious program designed to spread and replicate from one computer to another through telecommunication links or through sharing of removable storage media and files. i). Describe any four effects of a virus in a computer [4 Marks] ii). Describe any four symptoms of a computer that has virus [4 Marks] iii). Outline four parts of a computer that a virus can attack. [4 Marks] QUESTION THREE [20 MARKS] The table below needs to be created using DBMS software. i). Identify one open source DBMS software that can be used to implement this table. [1 Marks] ii). Identify a possible primary key for this table. Give a reason for your choice. [1 Marks] iii). Describe any three reasons for keeping records in a database. [3 Marks] iv). Identify a suitable data type for all the fields in the above table. [5 Marks] v). State and explain any other three functions of a DMBS software part from creating tables and databases. [6 Marks] vi). Data is one of the components of a database. State and explain any other three components. [3 Marks] vii). Explain why a table may need a foreign key. [1 Mark] QUESTION FOUR [20 MARKS] a) Identify and explain one feature in a word processor that can be used for each of the following tasks in a 400 hundred page document: i). Find and modify a phrase that appears severally in the document. [2 Marks] ii). Insert some text at the end of each chapter [2 Marks] iii). Insert the name of the author and page number at the bottom of each page [2 Marks] iv). Insert some transparent text behind the content of each page [2 Marks] v). Insert table of contents that show the chapters and page numbers [2 Marks] b) Explain the circumstances under which you will require the following spreadsheet features. i). Auto complete ii). Format painter iii). Function iv). Define name v). Background [10 Marks] QUESTION FIVE [20 MARKS] a) Presentation software is an application program used to create sequences of words and pictures that tell a story or help support a speech or public presentation of information. i). Identify any three open source presentation softwares [3 Marks] ii). Identify and explain any six important features of a presentation software [6 Marks] iii). Briefly explain how you can prepare a presentation of not more than 5 slides. [6 Marks] b) The following page was captured as a draft email: i). State the rationale for indicating the subject for this mail. [1 Mark] ii). Explain why it is not advisable in some circumstances to insert recipient addresses in a CC field. [1 Mark] iii). Identify two netiquette rules that were violated in this mail. [2 Marks] iv). State the largest size attachment send with this mail. [1 Mark]

UNIVERSITY EXAMINATIONS: 2013/2014 ORDINARY EXAMINATION FOR THE BACHELOR OF SCIENCE IN INFORMATION TECHNOLOGY/BUSINESS INFORMATION TECHNOLOGY BUSS 201 BIT 4401 KNOWLEDGE MANAGEMENT DISTANCE LEARNING DATE: AUGUST, 2014 TIME: 2 HOURS INSTRUCTIONS: Answer Question ONE and any other TWO QUESTION ONE a) Write brief notes on the concepts “Knowledge” and “knowledge management”. (4 Marks) b) Distinguish in detail, including using appropriate examples, between tacit knowledge and explicit knowledge. (4 Marks) c) You have been appointed to be the first Knowledge Manager of your organization. In your first meeting with your immediate supervisor, you are required to explain the importance of knowledge management to the organization. Explain FIVE benefits. (10 Marks) d) In any organization knowledge is a strategic asset. Discuss. (4 Marks) e) State and explain FOUR characteristics of Knowledge-driven organizations. (8 Marks) QUESTION TWO a) State and briefly describe the five steps in knowledge management process. (6 Marks) b) Describe the FOUR knowledge management accelerators . (8 marks) c) Describe THREE tools for knowledge codification. (6 Marks) QUESTION THREE a) Explain the FOUR modes of knowledge creation as suggested by Nonaka and Takeuchi (1995). (8 Marks) b) Distinguish between codification and personilization strategies in knowledge management. (6 Marks) c) Explain the importance of organizational culture in institutionalizing knowledge management. (6 Marks) QUESTION FOUR a) Describe FIVE information technology based methods, systems or tools that can be used in knowledge management. (10 Marks) b) Describe FIVE artificial intelligence systems that can be used in knowledge management. (10 Marks) QUESTION FIVE a) Explain FIVE non-information technology methods and tools that can be used in knowledge management. (10 Marks) b) Explain FIVE issues that are driving the need for knowledge management in modern organizations. (10 Marks)

UNIVERSITY EXAMINATIONS: 2013/2014 ORDINARY EXAMINATION FOR THE BACHELOR OF BUSINESS INFORMATION TECHNOLOGY BUSS 105 HUMAN RESOURCES MANAGEMENT DATE: AUGUST, 2014 TIME: 2 HOURS INSTRUCTIONS: Answer Question ONE and any other TWO QUESTION ONE: COMPULSORY a) Explain the four objectives of HRM (8 Marks) b) Describe five factors which influence organizational culture. (10 Marks) c) Discuss the four stages involved in the process of Human Resources Planning (12 Marks) QUESTION TWO a) What is the difference between recruitment and selection? (4 Marks) b) Identify and explain the eight 8 Stages in the Recruitment/Selection process. (16 Marks) QUESTION THREE a) Define the following terms in the context of Job design i) Job enlargement ii) Decentralization iii) Job enrichment iv) Job rotation v) Empowerment vi) Flexible working (12 Marks) b) Identify and describe four psychological aspects of work that can influence employee motivation (8 Marks) QUESTION FOUR a) Explain six advantages of delegation to an organization (12Marks) b) Performance appraisal can be described as the continuous process of monitoring staff performance in order to make realistic assessment and develop employee effectiveness. Explain how the performance appraisal process can enhance employee motivation? (8 Marks) QUESTION FIVE Globalisation is the process by which national barriers are broken down in the market within which organisations operate. Discuss the impact that globalisation has had on management of organizations? (20 Marks)

UNIVERSITY EXAMINATIONS: 2014/2015 ORDINARY EXAMINATION FOR THE BACHELOR OF BUSINESS INFORMATION TECHNOLOGY BUSS 105 HUMAN RESOURCE MANAGEMENT DATE: DECEMBER, 2014 TIME: 2 HOURS INSTRUCTIONS: Answer Question ONE and any other TWO QUESTION ONE: a) The managing director of a manufacturing company needs to know what value human resource planning will add to his organisation, what would you tell him? (10 Marks) b) Describe 6 ways of increasing employee motivation. (12 Marks) c) Describe advantages of internal recruitment. (8 Marks) QUESTION TWO: a) List and give a brief description of the recruitment and selection process (10 Marks) b) Define the following terms as used in recruitment and selection (4 Marks) (i) Job analysis (ii) Job description c) Describe 3 types of interviewing methods used during the selection process. (6 Marks) QUESTION THREE: Identify and explain the advantages and disadvantages of the following forms of working: (20 Marks) a) Teleworking b) Hot-desking c) Part-time d) Annualised hours QUESTION FOUR: a) With reference to performance appraisal explain the following appraisal techniques. – Behavioural anchored rating scale (BARS) – 360 degree appraisal – Management by objective – Critical incidence (12 Marks) b) Explain the importance of employee training to the organization. (8 Marks) QUESTION FIVE: Organisations are operating in a constantly changing environment where competition for talented workforce is very high. How would an organisation ensure that its employees have a positive psychological contract with the organisation? (20 Marks)

UNIVERSITY EXAMINATIONS: 2014/2015 ORDINARY EXAMINATION FOR THE BACHELOR OF SCIENCE IN INFORMATION TECHNOLOGY BIT2204 JAVA PROGRAMMING DATE: DECEMBER, 2014 TIME: 2 HOURS INSTRUCTIONS: Answer Question ONE and any other TWO QUESTION ONE a) Briefly explain the meaning following programming concepts. i) Java compiler (2 Marks) ii) Java Interpreter (2 Marks) iii)Java runtime environment (JRE) (2 Marks) b) Consider the following variable names and determine whether they illegal or legal identifiers of variables in java programming. Justify your answer for each case. i) Storing_place (2 Marks) ii) _studentName (2 Marks) iii) :-staffmember (2 Marks) iv) question? (2 Marks) c) Describe the meaning of the following concepts in the context of java programming and write a sample java code that demonstrates its implementation. i) Variable declaration (2 Marks) ii)Variable initialization (2 Marks) d) Write comments that explains the following java code. (4 Marks) int position; position = 5 + 3 * 3; System.out.println(position +2); System.out.println(2 * position); e) Write comments that explains the following java code [3 Marks] for ( int i = 0; i < maxID; i++ ) { if ( userID[i] != -1 ) continue; System.out.print(“UserID”+i+“:”+userID); } g) Write java code statements to accomplish the following. [4 Marks] i) If the variable “Num” is not equal to 7, print “value not 7”. ii) Print the message “welcome to kca University”. g) Explain the meaning of the term ‘byte code’ in the context of java programming [1mark] QUESTION TWO a) Define what is an array [2 Marks] b) Describe any three characteristics of an array [3 Marks] c) Write java code that declares an array and puts a value into the array [2 Marks] d) Explain the steps that a java program of compiling and running a java program. [4 Marks] e) Using one statement for each and some explanation, illustrate how the following string functions are implemented. Write an example java code to illustrate how each function can be used. [6 Marks] i) concat ii) charAt iii) indexOf h) Write a sample java code that convert the following alphabets to capital letters. [2 Marks] “Welcome! to java programming:” f). Briefly explain importance of Java virtual machine (JVM) [1 Mark] QUESTION THREE a) Write a java program that displays student IDs and first and last names of employees. [4 Marks] b) State and explain three main control structures that are used in structured programming.. Write an sample java code that implements each control structure [6 Marks] c) Explain the TWO types of errors encountered in java [4 Marks] c) Write a java program that implements the following Pseudocode. [6 Marks] if student’s grade is greater than or equal to 70 Print “A” else if student’s grade is greater than or equal to 60 Print “B” else if student’s grade is greater than or equal to 50 Print “C” else if student’s grade is greater than or equal to 40 Print “D” else Print “F” QUESTION FOUR a) Define the meaning of the term ‘comment’. Explain three sections of a program where comments can be used. (4 Marks) b) Write sample java code that demonstrate usage of comment. (2 Marks) d) Describe the importance of a constructor. Write a java code that demonstrates implementation of a constructor. ( 4 Marks) e) State and explain any four types of java METHODS. (4 Marks) f) What is the purpose of the following keywords as used Java Programming? Give examples to support your answer. (6 Marks) i) extends ii) exception iii. throws QUESTION FIVE a) Write a class named employee that instantiates a kcau_emp object from the class you created. Prompt the a user to enter personal details such as idno, name, occupation and then display all the values entered by the user (6 Marks) b) Explain the operation of the following program and predict its output. (4 Marks) Public class example { public static void main(String[] args) { String firstName = “Amr”; String middleName = “Ahmed”; String lastName = “Al-Ghamdi”; int age = 20; String initials = firstName.substring(0,1) + middleName.substring(0,1) + lastName.substring(0,1); String password = initials.toLowerCase() + age; System.out.println(“Your Password = ” + password); } } d) Describe the term Type qualifier and briefly explain four examples of type qualifiers. (6 Marks) e) Explain the following java features i) Java Virtual Machine (2 Marks) ii) package (2 mark)

UNIVERSITY EXAMINATIONS: 2013/2014 ORDINARY EXAMINATION FOR THE BACHELOR OF SCIENCE IN INFORMATION TECHNOLOGY/BUSINESS INFORMATION TECHNOLOGY BIT2108 OBJECT ORIENTED PROGRAMMING DATE: AUGUST, 2014 TIME: 2 HOURS INSTRUCTIONS: Answer Question ONE and any other TWO QUESTION ONE a) Explain the concept of object technology as used in application development. (4 Marks) b) Explain at least five features in any o bject oriented programming language that support object technology (10 Marks) c) With help of a sample program describe the structure of C++ program. (8 Marks) d) Explain how the concept of client-server is used in C++ program. (4 Marks) e) Differentiate between structure and class as used in C++. Give examples to support your argument. (4 Marks) QUESTION TWO a) Debug the following program. #include<ionstream.r> main ( ) { cout<<”enter two nubmers:”;//prompt cin>> number1; //Read number float number 1, number 2,sum, average; cin>>number 2; //from keyboard average=sum/2; sum=number 1+number 2; 2 void; cout<<”sum=”<<sum<<”\n”; cout<<”average=”<<average<<”\n”; } } (5 Marks) b) Find the errors in the following function prototype. i). Float average(a,b); ii). Int mul(int a,b); iii). Int display(); iv). Void vect(int&v,int&size); v). Void print(float data[],size=20); (5 Marks) c) State with a reason whether the following statements are true or false. (i) Function argument is a value returned by the function to the calling program. (ii) When a function returns a value, the entire function can be assigned to variable. (iii) When argument is passed by value the function works with the original arguments in the calling program. (iv) A function can return a value by reference. (v) When argument is passed by reference, a temporary variable is created in the calling program to hold the argument value. (5 Marks) d) Briefly discuss how each of the following visibility modifiers affects inheritance of member elements in derived classes. (i) Private (2 Marks) (ii) Public (1 Marks) (iii) Protected (2 Marks) QUESTION THREE a) What is operator overloading and why do we use this concept. Give the general syntax that is used to implement operator overloading. (4 Mrks) b) Write a program with base class animal with features, which can be inherited by class Human being and class domesticated animal. Create instances from all classes to demonstrate aspect of inheritance. (10 Marks) c) Explain using an example how classes help to achieve program modularization. (6 Marks) QUESTION FOUR a) Write methods for bank operations such as recording customer’s details, recording deposits and withdrawals. (Methods are declared within a class, main() is outside the class) Program should have the following: Methods  Get details  Make deposit  Make withdrawals  Enquiry(optional)  Main() (10 Marks) b) Explain how you could modify the above program to achieve data hiding. (5 Marks) c) Differentiate between intrinsic and user defined data type as used in C++. Give two examples in each case. (5 Marks) QUESTION FIVE a) Write a program to capture student’s details. In your program include the following. i). A constructor function ii). A destructor and iii). Other member function you may find necessary (15 Marks) b) Differentiate between the following type of function as used in C++ (i) Inline function (ii) Friend function (iii) Constructor function (iv) Virtual function (v) Recursive function (5 Marks)

UNIVERSITY EXAMINATIONS: 2013/2014 ORDINARY EXAMINATION FOR THE BACHELOR OF SCIENCE IN INFORMATION TECHNOLOGY/BUSINESS INFORAMATION TECHNOLOGY BIT1302 BUSS209 ELECTRONIC COMMERCE – DISTANCE LEARNING DATE: AUGUST, 2014 TIME: 2 HOURS INSTRUCTIONS: Answer Question ONE and any other TWO QUESTION ONE a) As a consultant, you have been approached to advice ABC Company Board on the importance of Electronic Commerce. Discuss your understanding and explain each of the following terms as used in e-commerce i) B2B ii) E- Procurement iii) Value Chain. iv) Virtual Private Networks v) XML (10 Marks) b) Explain the benefits of E-commerce marketing to producers (10 Marks) c) Outline at least four measures of web site effectiveness. (10 Marks) QUESTION TWO Explain the importance of the following infrastructures in e-commerce architecture. (Use appropriate examples) i) Security system ii) Payment system iii) Networks iv) Databases v) Data Services Layer (4Marks each max 20Marks) QUESTION THREE a) State and explain the meaning of digital cash (4 Marks) b) State and explain the benefits of a commercial website (10 Marks) c) Discuss at least four disadvantages of e-commerce to an organization (6 Marks) QUESTION FOUR Explain the various benefits in your opinion associated with E-Commerce especially in developing countries? (20 Marks) QUESTION FIVE a). Discuss at least FIVE security risks to both a firm’s website and network. (10 Marks) b). State and explain any FOUR models of electronic marketing (10 Marks)

UNIVERSITY EXAMINATIONS: 2014/2015 ORDINARY EXAMINATION FOR THE BACHELOR OF SCIENCE IN INFORMATION TECHNOLOGY BIT1301 PROBABILITY AND STATISTICS DATE: DECEMBER, 2014 TIME: 2 HOURS INSTRUCTIONS: Answer Question ONE and any other TWO QUESTION ONE (30 Marks) a) The table below shows Marks of students in a mathematics examination. Marks 12 −14 15 −17 18 −20 21−23 24 −26 27 −29 No. of students 2 6 a 8 4 1 Given that the mean is 19.9 , determine the i). Value of a ; (5 Marks) ii). Standard deviation (5 Marks) b) The length of 64 components produced in a workshop was found to follow a normal distribution with a mean of 20 mm and standard deviation of 2.5 mm .Calculate the: i). Probability of lengths less than 19.95 mm ; (3 Marks) ii). Probability of lengths longer than 22 mm ; (3 Marks) iii). Number of components having lengths between 18.5 mm and 24.8 mm . (4 Marks) c) An exploration firm finds that 5% of the test wells it drills yield a deposit of natural gas. If the firm drills 6 wells, what is the probability that i). Exactly 2 wells yield gas. ii). At least 1 well yields gas. iii).At most 3 wells yield gas. (6 Marks) d) The expected number of non-defective bolts in a box is 8 , and the variance is 1.6 .Find the probability that there is only one non-defective bolt in the box. (4 Marks) QUESTION TWO (20 Marks) a) The table below shows the average class size and the percentage of students passing an end term examination in nine schools. Average class size X50 60 50 60 80 50 80 40 70 Pass rate Y 30 60 40 50 60 30 70 50 60 i). Find the equation of the least squares line of regression of pass rate on the average class size. (8 Marks) ii). Predict the pass rate of the class with an average class of size 64. (2 Marks) b) The probability that a driver stopping at a petrol station will have his car tyres checked is 0.012 , the probability that he will have oil checked is 0.29 and the probability that he will have both oil and tyres checked is 0.07 .What is the probability that a driver stopping at this station will have neither his car tyres checked nor oil? (5 Marks) c) The Marks of 800 candidates in an examination were normally distributed with mean of 45 Marks and the standard deviation of 20 Marks. If 5% of the candidates obtained a distinction by scoring X Marks or more, estimate the value of X. (5 Marks) QUESTION THREE (20 Marks) a) State three properties of a normal distribution. (3 Marks) b) Draw the scatter diagram and calculate the Spearman’s rank correlation coefficient and interpret it from the following data interpret your results in both cases. X: 75 32 34 40 45 33 12 30 36 72 41 57 Y: 60 34 40 50 45 41 22 43 42 66 64 46 (10 Marks) c) The mean and standard deviation of 20 items was found to be 10 and 2 .Later on it was discovered that the item 12 was misread as 8.Calculate the correct mean and standard deviation. (7 Marks) QUESTION FOUR (20 Marks) a) A department supervisor is considering purchasing a photocopy machine. One consideration is how often the machine will need repairs. Let x denote the number of repairs during a year. Based on the past performance, the distribution of x is shown as follows. Number of repairs , x 0 1 2 3 P( x) 0.2 0.3 0.4 0.1 i). What is the expected number of repairs during a year? (3 Marks ii) What is the variance and standard deviation of the number of repairs during a year? (5 Marks) b) The percentage of defective components in a manufacturing process of an article is 2%. Find the probability that in a sample of 100 items chosen at random. i). Exactly 3 are defective (2 Marks) ii). At least 3 are defective (5 Marks) c) A particular model of a radio set carries the following price tags(Ksh.) 210 , 210 , 225 , 225 , 235 , 240 , 250 , 270 , 250 Find the mean deviation of the price. (5 Marks) QUESTION FIVE (20 MARKS) a) Define the following terms as used in probability: i). Independent event (2 Marks) ii). Exhaustive event (2 Marks) b) The domestic electricity consumption by households in a typical urban residence in Kenya fits a normal distribution with mean of 100kWh and a standard deviation of 16 kWh. i). Determine the proportion of the households which consume between 85 kWh and 110 kWh. (4 Marks) ii). The top 20% of the households are considered to be heavy consumers and are therefore advised to use energy saving devices. Determine the lower limit for the consumption by the households (4 Marks) c) From the following data of the heights (in inches) of a group of plants 6.1, 6.2, 6.2, 6.3, 6.1, 6.4, 6.4, 6.0, 6.5, 6.3, 6.4, 6.5, 6.6, 6.4, 6.3 Calculate i). Mean (2 Marks) ii). Median (1 mark) iii).semi interquartile range (2 Marks) iv). coefficient of skewness (3 Marks)

UNIVERSITY EXAMINATIONS: 2013/2014 ORDINARY EXAMINATION FOR THE BACHELOR OF SCIENCE IN INFORMATION TECHNOLOGY/BUSINESS INFORMATION TECHNOLOGY BIT1301 BUSS 202 PROBABILITY AND STATISTICS DATE: AUGUST, 2014 TIME: 2 HOURS INSTRUCTIONS: Answer Question ONE and any other TWO QUESTION ONE (30 Marks) a) The grades of a group of1000students in an exam are normally distributed with amean of70and standard deviation of10. A student from this group is selectedrandomly. i) Find the probability that his or her grade is greater than 80. (3 Marks) ii) Find the probability that his or her grade is less than 50. (3 Marks) iii) Find the probability that his or her grade is between50and80. (3 Marks) iv) Approximately ,how many students have grades greater than 80. (2 Marks) b) There are24elephants in a game reserve. The warden tags6of the elephantswith small radio transmitters and returns them to the reserve. The next month, herandomly selects5 elephants from the reserve. He counts how many of these elephants are tagged. Assume that no elephants leave or enter the reserve or die or give birth, between the tagging and the selection; and that all the outcomes of the selection are equally likely. Find the probability that exactly two of the selected elephants are tagged, giving your answer correct to three decimal places. (4 Marks) c) Let a random variable X have probability density function. X 0 1 2 3 4 P X x 0.08 0.15 0.45 0.27 0.05 Compute: i) Expected value of X ii) Standard deviation of X (6 Marks) d) Distinguish between binomial distribution and Poisson distribution. (4 Marks) e) On average one in 200 computers break down in a certain fir per day. Find the probability that out of a sample of 200 computers selected at random: i) None breaks down (2 Marks) ii) More than two breaks breakdown. (3 Marks) QUESTION TWO (20 Marks) a) In a school,60%of the pupils have access to the internet at home. A group of8students is chosen at random. Find the probability that i) exactly 5 have access to the internet. (2 Marks) ii) at least6students have access to the internet. (4 Marks) b) The following set of data represents the distribution of annual salaries of a random sample of 100 managers in a large multinational company: Salary Range ($’000’) Managers 20 but under25 525but under30 10 30but under35 25 35but under40 35 40but under45 25 45but under50 5 i) Calculate the mean and standard deviation. (7 Marks) ii) Calculate the Karl Pearson’s measure of skewness and comment on it. (4 Marks) iii) Calculate 95%confidence level for the annual mean salaries. (3 Marks) QUESTION THREE (20 Marks) a) Distinguish between correlation and regression. (4 Marks) b) The Marks scored by students in a mathematics and science tests were as shown in the table below. Students A B C D E F G H I J Mathematics 89 75 68 74 82 63 66 79 80 58 Science 85 77 74 72 80 68 62 78 83 59 i) Draw a scatter diagram of this data. (3 Marks) ii) Calculate Pearson’s correlation coefficient correct the answer to four decimal places. (7 Marks) iii) Calculate the rank correlation coefficient correct to four decimal places. (6 Marks) QUESTION FOUR (20 Marks) a) In a school, 60%of the pupils have access to the internet at home. A group of8 students is chosen at random. Find the probability that i) Exactly5 have access to the internet. (2 Marks) ii) At least6 students have access to the internet. (3 Marks) b) The probability that a driver stopping at a petrol station will have his car tyres checked is 0.012 , the probability that he will have both oil checked is 0.29and the probability that he will have both oil and tyres checked is 0.07 .What is the probability that a driver stopping at this station will have neither his car tyres checked nor oil? (4 Marks) c) The Marks of800candidates in an examination were normally distributed with meanof Marks and the standard deviation of20Marks. If5%of the candidatesobtained a distinction by scoring X Marks or more, estimate the value of X. (5 Marks) d) A bag contains6white and9black balls. Two drawings of4 balls are made suchthat (a) the balls are replaced before the second trial (b) the balls are not replaced4 before the second trial. Find the probability that the first drawing will give4black balls in each case. (6 Marks) QUESTION FIVE (20 Marks) a) IfP A 0.5, P B 0.3 andP A B 0.2 , obtain the probability that i) A occurs but not B . (3 Marks) ii) At least one of A and B occurs. (3 Marks) iii) Neither of A and B occurs. (2 Marks) b) The table below shows test scores and sales for various salespersons. Use it to answer the questions that follow. Salesperson 1 2 3 4 5 6 7 8 9 10 Testscore 44 65 50 57 96 94 110 34 79 65 Sales (Ksh ‘000’) 41 60 40 50 80 68 84 70 55 48 i) Using the least square method, determine the regression equation for sales on testscore. (10 Marks) ii) Estimate the weekly sales given that a salesperson makes a testscore of 100. (2 Marks)