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

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Math Expert
Joined: 02 Sep 2009
Posts: 52902
How likely is a bird to be classified as positive?  [#permalink]

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29 Oct 2017, 00:50
00:00

Difficulty:

55% (hard)

Question Stats:

50% (01:08) correct 50% (00:58) wrong based on 100 sessions

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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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Manager
Joined: 13 Apr 2010
Posts: 89
Re: How likely is a bird to be classified as positive?  [#permalink]

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29 Oct 2017, 04:42
1
Bunuel 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.

Clearly statement 1 and 2 are insufficient on its own .
In order to answer this DS question , we should know what percentage of birds have avian flu . There is no information about this statistics .
So, the answer is E .
Intern
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Concentration: General Management, Entrepreneurship
Schools: Sauder 'Dec 18
GPA: 3.79
WE: General Management (Energy and Utilities)
Re: How likely is a bird to be classified as positive?  [#permalink]

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29 Oct 2017, 08:00
Since the actual no. of birds having flue is no known, it is insufficient to answer the question even after combining two statements.
Manager
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Re: How likely is a bird to be classified as positive?  [#permalink]

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29 Oct 2017, 09:27
IMO: E.
We need ratio of birds with Avian Flue and Birds with Non-Avain flu.
Director
Joined: 27 May 2012
Posts: 681
How likely is a bird to be classified as positive?  [#permalink]

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24 Mar 2018, 03:41
Bunuel 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.

Initially I thought C then while posting that query found out how its E ,below is the working , hope it helps.

how likely means probability !

Probability = Positive cases / Total cases

1) we have no idea of other positive cases , we know that 80% of avian flu are positive only , NS.
2) Here we have know idea of avian flu, positive cases , NS

1+2 covers all the cases , avian flu + non avian flu cases

let there be 100 + 100 cases , probability =85/200 =17/40
let there be 100 + 200 cases , probability=90/300= 3/10

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- Stne

How likely is a bird to be classified as positive?   [#permalink] 24 Mar 2018, 03:41
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