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# For what percent of those tested for a certain

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SVP
Joined: 28 May 2005
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Location: Dhaka
For what percent of those tested for a certain [#permalink]

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07 Oct 2005, 14:48
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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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hey ya......

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Current Student
Joined: 28 Dec 2004
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Schools: Wharton'11 HBS'12

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07 Oct 2005, 17:05
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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Director
Joined: 21 Aug 2005
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07 Oct 2005, 20:50
Yes, fresinha12 is right.
We cannot determine for what % of those tested negative was the test accurate.

Ans is E

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SVP
Joined: 28 May 2005
Posts: 1700

Kudos [?]: 473 [0], given: 0

Location: Dhaka

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08 Oct 2005, 00:12
OA is E.

thank you guys for explaining. I choose C and I was wondering what is wrong here.
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08 Oct 2005, 00:12
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# For what percent of those tested for a certain

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