tian shan 4 - Q2, any idea?

tonydong

a certain characteristic in a large population has a distribution that is symmetirc about the mean. 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%

any idea?

thanks in advance

[此贴子已经被作者于2005-7-15 9:44:26编辑过]

happyfish0517

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