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标题: 请教一个probability的问题 [打印本页]

作者: stella_zq 时间: 2014-4-14 07:18 标题: 请教一个probability的问题

the probability that each stock in A stock market outperforms the Shanghai composite index is 30%. For three stocks, what is the probability that at least two stocks outperformed the Shanghai Composite index?

弱弱问下这题怎么做啊？

作者: adjani.zhang 时间: 2014-4-14 09:21

本帖最后由 adjani.zhang 于 2014-4-14 22:34 编辑

更正为如下
C32*(30%)^2*70% + (30%)^3

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