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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?

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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上一主题:CFA一级 Corporate Finance Reading37 的课后习题
下一主题:请问道德中的soft dollar commission/brokerage到底是啥意思?