# SOLUTION: refer to the following information. About 60% of adults get less than the recommended 8 hours of sleep per night according to a study conducted by the University of Washington.

Algebra ->  Algebra  -> Probability-and-statistics -> SOLUTION: refer to the following information. About 60% of adults get less than the recommended 8 hours of sleep per night according to a study conducted by the University of Washington.       Log On

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 Algebra: Probability and statistics Solvers Lessons Answers archive Quiz In Depth

 Question 574373: refer to the following information. About 60% of adults get less than the recommended 8 hours of sleep per night according to a study conducted by the University of Washington. In a random sample of 7 adults, a) what is the expected number of them that get less than the recommended 8 hours of sleep per night? (That is, find the mean.) b) what is the standard deviation of this distribution? Answer by stanbon(57362)   (Show Source): You can put this solution on YOUR website!About 60% of adults get less than the recommended 8 hours of sleep per night according to a study conducted by the University of Washington. In a random sample of 7 adults, a) what is the expected number of them that get less than the recommended 8 hours of sleep per night? (That is, find the mean.) mean = np = 7*0.6 = 4.2 -------- b) what is the standard deviation of this distribution? std = sqrt(npq) = sqrt(4.2*0.4) = 1.2961 ==================== Cheers, Stan H. =============