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27 February, 14:22

P (B) = 0.45 P (A or B) = 0.72 P (B/A) = 0.4 P (A) = ?

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  1. 27 February, 14:33
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    P (A or B) = P (A) + P (B) - P (A) * P (B | A)

    0.72 = P (A) + 0.45 - P (A) * 0.4

    0.72 - 0.45 = P (A) - P (A) * 0.4

    0.27 = P (A) * (1 - 0.4)

    0.27 = P (A) * 0.6

    P (A) = 0.27 / 0.6 = 0.45
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