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标题: tian shan 4 - Q2, any idea? [打印本页]

作者: tonydong 时间: 2005-7-15 08:37
标题: tian shan 4 - Q2, any idea?

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]

作者: happyfish0517 时间: 2005-7-15 14:58

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=84562&replyID=&skin=0

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