Question

Three tables listed below show random variables and their probabilities. However, only one of these is...

Three tables listed below show random variables and their probabilities. However, only one of these is actually a probability distribution.

A

B

C

X

P(X)

X

P(X)

X

P(X)

5

0.1

5

0.1

5

0.1

10

0.3

10

0.3

10

0.3

15

0.4

15

0.4

15

0.4

20

0.2

20

0.4

20

0.6

a. Which is it?

(Click to select)  B  C  A

b. Using the correct probability distribution, find the probability that x is: (Round the final answers to 1 decimal place.)

1. Exactly 15 =   
2. No more than 10 =   
3. More than 5 =   

c. Compute the mean, variance, and standard deviation of this distribution. (Round the final answers to 2 decimal places.)

1. Mean µ   
2. Variance σ2   
3. Standard deviation σ   
Math   Statistics-And-Probability   
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