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标题: 请大家看看这题怎么做啊？ [打印本页]

作者: Howard09 时间: 2009-4-29 20:44 标题: 请大家看看这题怎么做啊？

Q2:

A certain characteristic in a large population has a distribution that is symmetric about the mean m. If 68 percent of the distribution lies within one standard deviation d of the mean, what percent of the distribution is less than m + d ?

A. 16%

B. 32%

C. 48%

D. 84%

E. 92%

答案 D

多谢！！

作者: feierer 时间: 2009-5-9 21:09

同问！！！

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