3 設有A, B 二事件，且P( A )＝0.4, P(B|A)＝0.35, P(A∪B)＝0.69。則P( B )等於：
(A) 0.14
(B)0.43
(C)0.75
(D)0.59

答案：登入後查看
統計： A(17), B(143), C(7), D(6), E(0) #146306

詳解 (共 1 筆)

#745426
P(A int B) = P(A) * P(B con A) = 0.4*0.35 = 0.14,
P(B) = P(A uni B) - P(A) + P(A int B) = 0.69 - 0.4 + 0.14 = 0.43
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