回答(1)
ES2023-03-16 14:34:46
同学,你好~
P(AB)=4%是说AB同时发生的概率是4%
P(A∩B) = P(A)*P( B | A ) = 4%
Given "If event A occurred, the probability of B occurs is 80%"
即P( B | A ) = 80%
所以, P(A)=4% / 80%=5%
Given "The probability of A occurance equals that of B"
所以,P(A)=P(B)=5%
为什么不能用0.95*0.95?
因为AB不互相独立
所以,the probability of neither occurs=1-【P(A)+P(B)-P(A∩B)】=94%
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