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Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean

Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more? Why or why not? ( I really don't understand what they are asking??? Please help me understand this.)

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