李同学2019-02-05 22:30:52

The probability of Event A is 40%. The probability of Event B is 60%. The joint probability of AB is 40%. The probability (P) that A or B occurs, or both occur, is closest to: A 60% B 84% C 40% 查看解析 上一题 下一题 正确答案A 您的答案B本题平均正确率：78% Calculation rules for probabilities难度：容易 推荐：      答案解析 P(A or B) = P(A) + P(B) – P(AB) = 0.40 + 0.60 – 0.40 = 0.60 or 60%. 请问：这里没说A,B是什么关系，即独立？互斥？感觉直接用文氏图来求解有点不严谨？