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標題:

Probability

發問:

P(A) = 0.305, P(B) = 0.29, P(A|B) = 0.328, P(A) x P(B) = 0.305 x 0.29 = 0.08845. Find P(A or B)? 更新: To : micatkie Why P(A) x P(B) = 0.09512 and not equal to 0.08845 as stated in the question? Please explain.

最佳解答:

P(A) = 0.305 P(B) = 0.29 P(A|B) = 0.328 P(A and B) / P(B) = 0.328 P(A and B) / 0.29 = 0.328 P(A and B) = 0.09512 P(A or B) = P(A) + P(B) - P(A and B) = 0.305 + 0.29 - 0.09512 = 0.49988 2012-10-07 15:10:21 補充： When A and B are independent, P(A and B) = P(A) x P(B) When A and B are dependent, P(A and B) ≠ P(A) x P(B)

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