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Suppose college students average 7.3 hours of sleep per night with a standard deviation of 45...

Suppose college students average 7.3 hours of sleep per night with a standard deviation of 45 minutes, and suppose that this is normally-distributed.

What is the probability that a randomly-selected college student sleeps for more than 8.1 hours?
Probability =

What is the 60th percentile for college-student sleep times? Round your answer to four decimal places.
60th percentile = hours

Math   Statistics-And-Probability   
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