# Random Variables Quiz 3

1. If $X$ and $Y$ are random variables, then $E(X-Y)$ is equal to

2. Which of the following is a characteristic of the probability distribution of a random variable?

3. The number of children in a family is an example of ________ variable

4. In generating random numbers the probability of each digit/number is

5. Discrete data is usually generated by the process

6. The amount of milk produced by a cow is _________ variable

7. In a family with two children, how many are girls there

8. The number of deaths in a road accident is an example of ____________ variable

9. The set of all possible outcomes of a random experiment is called

10. Usually measurements give rise to ________ data

11. A variable which takes measurable values is called a

12. Random numbers are generated by some

13. A Chi-Square random variable can assume the value

14. The number of automobile accidents per year in Multan city is an example of

15. If $X$ and $Y$ are independent random variables, then $Var(X-Y)$ is equal to

16. Continuous variable can assume ___________ values

17. A variable which can assume all values in the range is called

18. Sum of dots when two dice are rolled is an example of

19. A discrete variable is also called

20. In generating random number there are _________ number of assumptions to follow

A Random Variable (random quantity or stochastic variable) is a set of possible values from a random experiment.

The domain of a random variable is called sample space. For example, in the case of a coin toss experiment, there are only two possible outcomes, namely heads or tails. A random variable can be either discrete or continuous. The discrete random variable takes only certain values such as 1, 2, 3, etc., and a continuous random variable can take any value within a range such as the height of persons.