Answered

100,000 random people were tested for condition A. Robert's doctor told him he tested positive for condition A. If the test is 99% accurate and condition A is rare one out of every thousand people have it. What is the probability that testing positive means Roberto has condition A



Answer :

sedricwm
I think it is about 80%, the rareness of the type is not going to affect the the machine very much.

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kgpspammm

He would have a 9% of having the rare condition.

Hope this helps :)