PART A

Question 1

Using your own words, explain what a continuous random variable and a continuous probability density function are. Give examples.

Question 2

Given that x is a continuous random variable, with the probability density function

F(x) =1/2-x/8, 0x  <  3. 

Question 3

A set of final examination marks in an accounting course appear to be normally distributed with a mean of 64 and a standard deviation of 8.

a)      What is the probability of getting a mark of 75 or less on this exam?

b)      What is the probability of getting a mark of more than 85 on this exam?

c)      What is the probability of students scoring between 85 and 100?

d)      70% of the students have a mark higher than what mark?

e)      25% of the students have a mark less than what mark?

PART B

Question 1

List the basic functions of an operating system.

Question 2

Explain what virtual memory is. Give an example of a program that may need a lot of memory for data.

Question 3

What is multi-tasking and multi-programming? Explain the difference.

Question 4

What is a Real Time Operating System? Explain.

Question 5

What is the difference between application software and system software?