Walkabout wrote:
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 ?
(A) 16%
(B) 32%
(C) 48%
(D) 84%
(E) 92%
Let's first sketch a distribution that is symmetric about the mean m.
Notice that m+d represents 1 unit of standard deviation ABOVE the meanLikewise, m-d represents
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