问题描述:
The distribution of the numbers of hours that students at a certain college studied for final exams has a mean of 12 hours and a standard deviation of 3 hours.Which of the following numbers of hours are within 2 standard deviations of the mean of the distribution?Indicate all such numbers
A.2 B.5 C10 D.14 E.16
A.2 B.5 C10 D.14 E.16
问题解答:
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