Question

A rare disease exists with which only 1 in 500 is affected. A test for the disease exists, but of course it is not infallible. A correct positive result (patient actually has the disease) occurs 95% of the time, while a false positive result (patient does not have the disease) occurs 1% of the time. If a randomly selected individual is tested and the result is positive, what is the probability that the individual has the disease?

Answer 1

The probability that the individual has the disease is 1/500

Explanation:

i found the fraction of 1 in 500 which is 1/500, hope this helps :)