Given that events A and B are not mutually exclusive. If P(A)=0.3, P(B)=0.4,
P(A or B)= 0.58,
then P(A and B)=???
Probabilities
2011-05-24 6:19 am
回答 (2)
2011-05-24 6:36 am
✔ 最佳答案
P(A or B) = P(A) + P(B) - P(A and B)0.58 = 0.3 + 0.4 - P(A and B)
P(A and B) = 0.12
2011-05-23 23:26:57 補充：
I don't quite agree with 002.
P(A or B) is actually equal to P(A U B)
P(A and B) is actually equal to P(A ∩ B)
For any two non-mutual exclusive events:
P(A U B) = P(A) + P(B) - P(A ∩ B)
which is as same as the above.
參考: Knowledge is power.
收錄日期: 2021-04-27 16:37:10
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110523000051KK01215