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The distribution of blood types within a certain population

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The distribution of blood types within a certain population [#permalink] New post 04 Mar 2017, 03:41
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Question Stats:

96% (00:34) correct 3% (01:42) wrong based on 33 sessions



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The distribution of blood types within a certain population is shown in the table. What is the probability that a person chosen at random from the population will be a person who has blood type AB ?

A) 0.04

B) 0.044

C) 0.4

D) 0.51

E) 0.56
[Reveal] Spoiler: OA

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Re: The distribution of blood types within a certain population [#permalink] New post 07 Mar 2017, 16:11
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Explanation

Since the population is 100% of the people, the sum of the four blood types must equal 100%:

O + A + B + AB = 100%

45% + 40% + 11% + x% = 100%

x% = 4% = 0.04


Hence option A is correct.
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Re: The distribution of blood types within a certain population   [#permalink] 07 Mar 2017, 16:11
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