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Which of the following sets has maximum standard deviation? A) {1, 2,

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Which of the following sets has maximum standard deviation? A) {1, 2, [#permalink]

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New post 23 May 2017, 05:01
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Question Stats:

79% (00:30) correct 21% (00:27) wrong based on 33 sessions

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Which of the following sets has maximum standard deviation?

A) {1, 2, 3, 4, 5}
B) {2, 4, 6, 8, 10}
C) {-8, -6, -5, -3, -1}
D) Sets of 5 distinct Prime Numbers
E) {51, 52, 54, 55, 56}

Source: www.GMATinsight.com
[Reveal] Spoiler: OA

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Re: Which of the following sets has maximum standard deviation? A) {1, 2, [#permalink]

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New post 23 May 2017, 10:20
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My approach:
I narrowed the answer choices by distance. It's the faster way to do instead of calculating the standard deviation
A All numbers increase by 1. When you look at the other answer choices, you'll see that others increase more than 1 so A is out
B All numbers increase by 2. When you look at the other answer choices D is a better answer so B is out
C The numbers increase by 1 or 2. B is a better answer than C so C is out
D D is the answer. 2, 3, 5, 7 and 11 could be the numbers. The numbers increase by 1 then by 2 and by 2 and by 4. The distance is more tha answer B
E The numbers increase 1 or 2. E is out.

Answer is D
Re: Which of the following sets has maximum standard deviation? A) {1, 2,   [#permalink] 23 May 2017, 10:20
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Which of the following sets has maximum standard deviation? A) {1, 2,

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