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标题: 天山4－#2 [打印本页]

作者: applebees 时间: 2005-9-17 19:08 标题: 天山4－#2

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?

Answer: D 84%

能否帮我解释一下呢？

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