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If the rate of steroid use among professional athletes is 1 in 50: (a) What is the probability that a professional athlete chosen at random

If the rate of steroid use among professional athletes is 1 in 50:

(a) What is the probability that a professional athlete chosen at random will have a negative

test result for steroid use?

(b) If the athlete tests positive, what is the probability that he has actually been using

steroids?

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