What percent of athletes who test positive for the drug are actually using the drug? Answer: 77 28
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Let us define some events
A : an athlete is using the drug.
B : an athlete is bkt using the drug.
E : an athlete tests positive.
It is given that
P(A) = 0.09, P(B) = 1 - 0.09 = 0.91
P(E|A) = 0.94, P(E|B) = 0.08
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