Topic: Random Variable and Probability Distribution

1. Suppose four cellphones are tested. Let D represent the defective cellphone and N for non-defective cellphone. How many possible outcomes will occur from the experiment?

A. 15

B. 16 ?

C. 17

D. 18

2. Based on number 1, if we let X be the random variable representing the non-defective cellphones. What are the possible values of the random variables?

A. 0, 1, 2

B. 0, 1, 2, 3

C. 0, 1, 2, 3, 4

D. 0, 1, 2, 3, 4, 5

3. Which of the followings is probability distribution?

A. P(1)= 0.42, P(2) = 0.31, P(3)=0.37

B. P(1)= 9/47, P(2) = 4/14, P(3)=1/14

C. P(1)= 0.08, P(2) = 0.12, P(3)=1.03

D. P(1)= 10/33, P(2) = 12/33, P(3)=10/33

4. If the mean of the probability that a customer will buy is mean = 4.0 and the variance is 8.00. Which of these statement is the correct interpretation?

A. The probability that a customer buying a number of items in a grocery store is very far from the mean.

B. The probability that a customer buying a number of items in a grocery store is away from the mean.

C. The probability that a customer buying a number of items in a grocery store is very close from the mean.

D. None of the above.

5. If the mean of the probability of producing the number of defective flashlight is mean = 0.7 and the variance is 1.01. Which of these statement is the correct interpretation?

A. The probability of producing the number of defective flashlightis very far from the mean.

B. A. The probability of producing the number of defective flashlightis away from the mean.

C. A. The probability of producing the number of defective flashlightis close from the mean.

D. None of the above