1 已知 P(A | B) = 0.4, P= 0.6 , P(A ∩Bc ) ..-阿摩線上測驗
1 已知 P(A | B) = 0.4, P = 0.6 , P(A ∩Bc ) =0.2,則 P(A ∪ B) =?
(A)0.6
(B)0.7
(C) 0.8
(D) 0.9
2F silentsimon 小二上 (2018/06/30)
=0.6*0.4 =0.24 P(B)與P(Bc')可相互抵消 P(A ∩B)+P(A ∩Bc )=P(A) 0.24+0.2=0.44 P(A ∪ B)=P(A)+P(B)-P(A ∩B) =0.44+0.6-0.24 =0.8 |
3F
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