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The time a student sleeps per night has a distribution with mean 6.4 hours and a...

The time a student sleeps per night has a distribution with mean 6.4 hours and a standard deviation of 0.4 hours. Find the probability that average sleeping time for a randomly selected sample of 34 students is more than 6.5 hours per night.

Math   Statistics-And-Probability   
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Answer #1

µ = 6.4

sd - 0.4

n = 34

                         

                          = P(Z > 1.46)

                          = 1 - P(Z < 1.46)

                          = 1 - 0.9279

                          = 0.0721

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