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?