The average student spends about 17 hours each week preparing for classes; preparation for classes include...

Question:

the average student spends about 17 hours each week preparing for classes; preparation for classes include homework, reading and any other assignment. Assume the standard deviation if time spent preparing for class is 4 hours. if you select a random sample of 16 students. what is the probability that the mean time spent preparing for classes is at least 16 hours per week?

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