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# How likely is a bird to be classified as positive?

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Joined: 18 Oct 2012
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How likely is a bird to be classified as positive? [#permalink]

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16 Nov 2012, 01:56
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How likely is a bird to be classified as positive?

(1) 80 percent of birds with avian flu are classified as positive.

(2) 5 percent of birds without avian flu are classified as positive.
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Re: How likely is a bird to be classified as positive? [#permalink]

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16 Nov 2012, 02:32
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I doubt the OA.
Do also mention the source please.
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Re: How likely is a bird to be classified as positive? [#permalink]

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16 Nov 2012, 02:38
I got it from my course materials. I believe it is from Barrons - 2007 / Test 1, but I didn't find it on the internet. (this is what it is written on the Test materials as a source). I also doubt the OA and completely do not agree with it.
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Re: How likely is a bird to be classified as positive? [#permalink]

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16 Nov 2012, 05:12
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Anichka wrote:
How likely is a bird to be classified as positive?

(1) 80 percent of birds with avian flu are classified as positive.

(2) 5 percent of birds without avian flu are classified as positive.

The answer to this question is E, not D. We need to know the percentage of birds with avian flu to answer the question.
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Re: How likely is a bird to be classified as positive? [#permalink]

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24 Oct 2013, 17:26
Bunuel wrote:
Anichka wrote:
How likely is a bird to be classified as positive?

(1) 80 percent of birds with avian flu are classified as positive.

(2) 5 percent of birds without avian flu are classified as positive.

The answer to this question is E, not D. We need to know the percentage of birds with avian flu to answer the question.

Hi bunuel

This question looks very abstract . How can one define which bird is considered to be positive?
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Re: How likely is a bird to be classified as positive? [#permalink]

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24 Oct 2013, 21:26
overlapping sets question -

Avian flue // Non-avian flue
Positive 0.8 (TA) 0.05(NA)
not Positive
============================
Total Avian flue(TA) //Total Non-avian flue

Positive =0.8TA+0.05Na
since we dont know TA and NA, we cant find total positive
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Re: How likely is a bird to be classified as positive? [#permalink]

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16 Jan 2014, 04:46
Lol strange question. Looked at it, went straight for E.

Reasoning: If there were 1000 birds, of which have 100 the avian flu, 80 would be positive and of the other 900 45 were positive. But since we don't know nothing about any total percents or numbers, we can't solve! Hence E. Pretty awkward though.
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Re: How likely is a bird to be classified as positive? [#permalink]

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11 Aug 2015, 03:05
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Re: How likely is a bird to be classified as positive? [#permalink]

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05 Aug 2016, 08:00
Anichka wrote:
How likely is a bird to be classified as positive?

(1) 80 percent of birds with avian flu are classified as positive.

(2) 5 percent of birds without avian flu are classified as positive.

The moment you see "How likely" ? you should realise that it is asking about Positive bird /Total Bird

Since Both the statments are talking about % values , we cannot calcualte the NUMBER of BIRDS
we dont know 80% of what (What is total number of birds in question)
same with statement 2

ANSWER IS E
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Re: How likely is a bird to be classified as positive?   [#permalink] 05 Aug 2016, 08:00
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# How likely is a bird to be classified as positive?

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