设A,B为随机事件,且 P(A) =0.4, P(B) =0.2 ,则p(B|A)=
A、0.2
B、0.4
C、0.5
D、1
【正确答案】:C
【题目解析】:
因为所以AB=B,
P(A) =0.4, P(B) =0.2 ,则p(B|A)=
"> P(A) =0.4, P(B) =0.2 ,则p(B|A)=">设A,B为随机事件,且 P(A) =0.4, P(B) =0.2 ,则p(B|A)=
设A,B为随机事件,且 P(A) =0.4, P(B) =0.2 ,则p(B|A)=
因为所以AB=B,