400-1816-180
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PS151-180
【OG20-P171-166題】
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%
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答案：
D
數(shù)據(jù)分布
問：數(shù)據(jù)比m+1個標準差d這個數(shù)小的概率是多少？
1-(1-68%)/2=84%
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