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标题: 请教一道GWD数学题 - 标准方差 [打印本页]

作者: sisucsxs 时间: 2009-7-11 16:04 标题: 请教一道GWD数学题 - 标准方差

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%

没看懂题目 ...请教思路和步骤~~谢谢~~

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