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Question 1 of 3 Which of the following is true about the random variables X, Y,...

Question 1 of 3 Which of the following is true about the random variables X, Y, and Z?

X is binomial with n = 20 and p = .22.

Y is binomial with n = 40 and p = .32.

Z is not binomial. All of the above are true.

Only (A) and (B) are true.

Question 2 of 3 What is the probability that exactly 2 of the 20 older adults prefer organic? (Note: Some answers are rounded.)

.105

190

7.12

.22

.05

Question 3 of 3 What is the mean and standard deviation of the random variable Y (the number of younger adults out of 40 who prefer organic)? Answers may be rounded.

Mean: 12.8 Standard Deviation: 2.95

Mean: 40 Standard Deviation: .32

Mean: .32 Standard Deviation: 40

Mean: 12.8 Standard Deviation: 8.704

We cannot find the mean and standard deviation since the probability distribution table is not given.

Math   Statistics-And-Probability   
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