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9. (8 points) The average sleeping time per night of high school students is normally distributed with a standard deviation of 45 minutes. A random

9. (8 points) The average sleeping time per night of high school students is normally distributed with a standard deviation of 45 minutes. A random sample of 4 students was taken in order to estimate the mean sleeping time for the population of all high school students. What is the probability that the sample mean exceeds the population mean by more than 1.9 hours

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