求概率题的计算已知p(A否)=0.3(打不出那个横杠) p(B)=0.4 p(A"B否")=0.5 求条件概率p(B/A+B否)_数学解答

求概率题的计算
已知p(A否)=0.3(打不出那个横杠) p(B)=0.4 p(A"B否")=0.5 求条件概率
p(B/A+B否)

人气：250 ℃　时间：2020-10-01 07:32:28

解答

由题,P(A)=0.7,P(B否)=0.6,P(AB)=P(A)-P(A"B否") = 0.7-0.5 = 0.2P(A+B否)=P(A)+P(B否)-P(A"B否") = 0.7+0.6-0.5 = 0.8P[B(A+B否)]=P(BA+B"B否")（分配律）=P(AB) =0.2∴P(B/A+B否) =P[B(A+B否)]/P(A+B否) =P(AB)/P(...