EBook Problems Distrib RV
EBook Problems Set - Random Variables
Problem 1
The probability model below describes the number of repair calls that an appliance repair shop may receive during an hour:
| Repair calls | 0 | 1 | 2 | 3 |
| P(x) | 0.1 | 0.3 | 0.4 | 0.2 |
The probability that the number of repair calls is at least 2 is:
- Choose one answer.
- (a) 0.8
- (b) 0.2
- (c) 0.4
- (d) 0.6
Answer
Problem 2
In a litter of seven kittens, three are female. You pick two kittens at random. The probability model for the number of male kittens is:
| Number males | 0 | 1 | 2 |
| Probability | 0.143 | 0.571 | 0.286 |
The expected number of males is:
- Choose one answer.
- (a) 0.64
- (b) 1.7
- (c) 1.14
- (d) 2.1
Answer
Problem 3
Let X represent a discrete random variable that takes any of the values and probabilities given below:
| X | -2 | 5 | 6 |
| P(X) | 0.4 | 0.4 | __ |
The probability for X = 6 is missing. What is it?
- Choose one answer.
- (a) It cannot be determined from the information given
- (b) 0.2
- (c) 0.6
- (d) 2.3
Answer
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