Homework Help: Probability

Posted by Erica on Friday, January 27, 2012 at 6:51am.

A screening test for a disease shows a positive test result in 95% of all cases when the disease is actually present and in 20% of all cases when it is not. When the test was administered to a large number of people, 21.5% of the results were positive. What is the prevalence of the disease?

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