Rachel2019-12-10 21:46:49
RachelSuppose that 5 percent of the stocks meeting your stock- selection criteria are in the telecommunications (telecom) industry. Also, dividend- paying telecom stocks are 1 percent of the total number of stocks meeting your selection criteria. What is the probability that a stock is dividend paying, given that it is a telecom stock that has met your stock selection criteria? 根据P(A|B)=P(A)P(B|A)/P(B)我得出答案1%。为什么答案是1%/5%=0.2？
回答（1）
Evian, CFA2019-12-11 14:54:32
Evian, CFA胡同学你好，
我们根据提议设定：
A事件：telecom stock that meets criteria
B事件：dividend paying stock that meets criteria
AB事件同时发生：stock is dividend paying and telecom stock that meets criteria
已知条件：P（AB）=1%，P（A）=5%
要求的是：P（B|A）
P（B|A）=P（AB）/P（A）=1%/5%=0.2
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