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Drug Tests

Probability puzzles require you to weigh all the possibilities and pick the most likely outcome.

 

Puzzle ID:#8782
Fun:*** (2.3)
Difficulty:*** (2.2)
Category:Probability
Submitted By:lesternoronha1****

 

 

 



10% of the people in a certain population use an illegal drug. A drug test yields the correct result 90% of the time, whether the person uses drugs or not. A random person is forced to take the drug test and the result is positive. What is the probability he uses drugs?




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