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Assume one person out of 1,000 is infected with a virus, and there is a test...

Assume one person out of 1,000 is infected with a virus, and there is a test in which 2.5% of all people taste positive for the virus although they do not really have it. If you test negative on this test, then you definitely do not have the virus.

a) Draw a tree diagram

b) What is the chance of having the virus, assuming you test positive for it?

Math   Statistics-And-Probability   
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