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Question

Suppose that the reliability of a HIV test is specified as follows:Of people having HIV, 90 of the test detect the disease but 10 go undetected. Of people free of HIV, 99 of the test are judged HIV-ive but 1 are diagnosed as showing HIV+ive. From a large population of which only 0.1 have HIV, one person is selected at random, given the HIV test, and the pathologist reports him/her as HIV+ive. What is the probability that the person actually has HIV?

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Solution


E- Person selected has hiv
F- does not have hiv
G- Test judge hiv positive
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