Question 318374
The solution is a long story.
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P(bm|fm) = P(bm and fm)/P(fm)
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= P(bm and fm)/[P(fm and bm)+P(fm and not bm)]
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= [0.2*0.7]/[0.2*0.7 + 0.1*0.8] = 0.14/0.22 = 7/11
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Cheers,
Stan H.