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For what percent of those tested for a certain

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For what percent of those tested for a certain [#permalink] New post 07 Oct 2005, 13:48
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Q 35.
For what percent of those tested for a certain infection was the test accurate; that is, positive for those who had the infection and negative for those who did not have the infection?
(1) Of those who tested positive for the infection, 1/8 did not have the infection.
(2) Of those tested for the infection, 90 percent tested negative.
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 [#permalink] New post 07 Oct 2005, 16:05
hmm

I would go with E....

from what I gather we know what percent tested positve and how many of them were false...but we dont know how many of those tested negative were infact negative..?
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 [#permalink] New post 07 Oct 2005, 19:50
Yes, fresinha12 is right.
We cannot determine for what % of those tested negative was the test accurate.

Ans is E
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 [#permalink] New post 07 Oct 2005, 23:12
OA is E.

thank you guys for explaining. I choose C and I was wondering what is wrong here.
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  [#permalink] 07 Oct 2005, 23:12
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