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标题: 求高手解答GWD15套Math的第二题~~~！！！ [打印本页]

作者: mu1huizi 时间: 2009-11-3 20:21
标题: 求高手解答GWD15套Math的第二题~~~！！！
Q2:

A certain characteristic in a large population has a distribution that is symmetric(对称的) 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%

Answer: D

做的时候连题目都没看懂，望大牛解答！感激不尽！！！

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