设事件A:某人是聋子,B:某人是盲人
则P(A) = 0.005,P(B) = 0.0085,P(B|A) = 0.12
则要求又聋又盲的人即P(AB) = P(B|A)*P(A) = 0.0006
盲人中是聋子即P(A|B) = P(AB)/P(B) = 0.0006/0.0085 = 0.0706
设事件A:某人是聋子,B:某人是盲人
则P(A) = 0.005,P(B) = 0.0085,P(B|A) = 0.12
则要求又聋又盲的人即P(AB) = P(B|A)*P(A) = 0.0006
盲人中是聋子即P(A|B) = P(AB)/P(B) = 0.0006/0.0085 = 0.0706