For the next Olympics, a firm has created a test to catch athletes who took performance-enhancing drugs. The test has the following properties: Accuracy:99% if the person has taken the drug, if the person has not taken the drug, the test will be negative in 90% of the cases.  You believe that 5% of athletes take the performance enhancing drug: If an athlete tests positive from the test, what is the probability that he actually cheated and took some drugs?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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For the next Olympics, a firm has created a test to catch athletes who took
performance-enhancing drugs. The test has the following properties: Accuracy:99% if the person has taken the drug, if the person has not taken the drug, the test will be negative in 90% of the cases. 

You believe that 5% of athletes take the performance enhancing drug: If an
athlete tests positive from the test, what is the probability that he actually
cheated and took some drugs?

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