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%
QX:
If the probability is 0.54 that Stock A will increase in value during the next month and the probability is 0.68 that Stock B will increase in value during the next month, what is the greatest possible value for the probability that neither of these two events will occur?
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发表于 2007-11-14 21:31:00
楼主
,就当作正态分布好了,50%+68%/2=84%