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 ?
Mean is 50% Within m + d is the area that centers around the mean 50% and covers one standard deviation d. From the stimulus, that area is as big as 68%, centering 50%. So m + d starts from 16% and ends on 84%
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发表于 2010-12-4 00:53:44
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