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More probability

Posted By: stw672
Date: Wednesday, 30 July 2008, at 1:17 p.m.

In Response To: More probability (Frigo)

Not quite.

Assume 1000 women are tested. 990 do not have cancer. 10 do. Of the 990 who don't 99 will test positive. Of the 10 who do 9 will test positive. So you get 108 positive results. 9 of these are genuine. 9/108 = 0.083 So the probability that the woman has cancer if she tests positive is 8.3%

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