New York University STAT-UB STAT-UB 06 .Suppose the lengths of the pregnancies of a certain animal are approximately normally distributed with mean =289days and standard deviation
normally distributed with mean μ=289 days and standard deviation σ=15 days.
2.Time spent using e-mail per session is normally distributed, with μ=7 minutes and σ=2 minutes
c) If you select a random sample of 100 sessions, what is the probability that the sample mean is between 6.8 and 7.2 minutes?
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