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标题: OG13-MATH-PS-112 [打印本页]

作者: ZNrainbow 时间: 2012-11-6 13:03
标题: OG13-MATH-PS-112
112. A certain characteristic in largepopulation has a distribution that is symmetric about the mean m. If 68 percentof the distribution lies within one standard deviation d of mean, what percent ofthe distribution is less than m+d?
A. 16%
B. 32%
C. 48%
D. 84%
E. 92%

The correct answer is D.

作者: Koothrappali 时间: 2012-11-6 13:49

112. A certain characteristic in largepopulation has a distribution that is symmetric about the mean m. If 68 percentof the distribution lies within one standard deviation d of mean, what percent ofthe distribution is less than m+d?
A. 16%
B. 32%
C. 48%
D. 84%
E. 92%

The correct answer is D.

-- by 会员 ZNrainbow (2012/11/6 13:03:35)

见附件。均值是m，一个标准差是d。

作者: ZNrainbow 时间: 2012-11-6 17:12
标题: 太感激了！我就记得以前学过这个图，但是死活想不出来了，第一次在论坛上问问题，竟然有人回复！话说。。。我不知道怎么回复。。。

-- by 会员 ZNrainbow (2012/11/6 13:03:35)

见附件。均值是m，一个标准差是d。

-- by 会员 Koothrappali (2012/11/6 13:49:33)

作者: lixiaohu 时间: 2014-4-4 20:30
同样math里这道题看不懂，多谢画图

作者: bocaibear 时间: 2014-4-4 23:19
做这个题首先要知道几个基本的知识，within one standard deviation is 68%，within two standard deviation is 95%,within three standard deviation is 98%,该题要求的是小于一个m+d，所以就是（100%-68%）/2

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