p(a非)=0.3,p(a*b非)=0.5,P(b)=0.4,求p(b|aUb非)
问题描述:
p(a非)=0.3,p(a*b非)=0.5,P(b)=0.4,求p(b|aUb非)
答
P(~A)=0.3
P(B)=0.4
P(A~B)=0.5
P(B|AU~B)=P(A,AU~B)/P(AU~B)
=P(AB)/[1-(P(B)-P(AB)]
P(AB)=P(A)-P(A~B)=0.2
∴P(B|AU~B)=0.25你把下面一题也歇了吧,哈