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Posted by Moby Dick
on 29/10/2009, 1:10 pm
0.5% of tennis players are using a drug. The test for this drug is 99% accurate. If a player tests positive, what is the probability that he is using the drug (to 4 digits, excluding leading zeros)?
(Inspired by a certain tennis player who has just released a biography in which he admitted using crystal meth)
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