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More than 100 million people around the world are not getting enough sleep; the average adult...

More than 100 million people around the world are not getting enough sleep; the average adult needs between 7.5 and 8 hours of sleep per night. College students are particularly at risk of not getting enough shut-eye.

A recent survey of several thousand college students indicated that the total hours of sleep time per night, denoted by the random variable X, can be approximated by a normal model with E(X) = 6.83 hours and SD(X) = 1.24 hours.

A) Find the probability that the hours of sleep per night for a random sample of 4 college students has a mean x between 6.73 and 6.97.

(use 4 decimal places in your answer)

B) Find the probability that the hours of sleep per night for a random sample of 16 college students has a mean x between 6.73 and 6.97.

(use 4 decimal places in your answer)

C) Find the probability that the hours of sleep per night for a random sample of 25 college students has a mean x between 6.73 and 6.97.

(use 4 decimal places in your answer)

Math   Statistics-And-Probability   
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