SOLUTION: College students average 8.7 hours of sleep per night with a standard deviation of 40 minutes. If the amount of sleep is normally distributed, what proportion of college students s

Question 836479: College students average 8.7 hours of sleep per night with a standard deviation of 40 minutes. If the amount of sleep is normally distributed, what proportion of college students sleep for more than 9.6 hours?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
College students average 8.7 hours of sleep per night with a standard deviation of 40 minutes. If the amount of sleep is normally distributed, what proportion of college students sleep for more than 9.6 hours?
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z(9.6) = (9.6-8.7)/(2/3) = 1.35
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z(x > 9.6) = P(z > 1.35) = normalcdf(1.35,100) = 0.0885
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Cheers,
Stan H.
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