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Which of the following lists has the greatest standard deviation?

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Which of the following lists has the greatest standard deviation?  [#permalink]

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New post 27 Nov 2018, 00:27
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

55% (00:52) correct 45% (00:59) wrong based on 49 sessions

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Re: Which of the following lists has the greatest standard deviation?  [#permalink]

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New post 27 Nov 2018, 10:14
Bunuel wrote:
Which of the following lists has the greatest standard deviation?

A. 10, 20, 30, 40, 50
B. 10, 30, 30, 30, 50
C. 10, 25, 30, 35, 50
D. 10, 10, 30, 50, 50
E. 20, 20, 30, 40, 40


Greatest SD would be of the one which is at highest distance from the mean value so out of the given options D stands out with value 20 from mean so highest SD...
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Which of the following lists has the greatest standard deviation?  [#permalink]

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New post Updated on: 02 Dec 2018, 00:21
Let us look at the distances of each series from mean.
A: mean = 30, distances : 20,10,0,10,20
B : mean : 30, distances : 20, 0,0,0 20
C: mean: 30, distances: 20,5,0,5,20
D: mean: 30, distances: 20,20,0,20,20
E: mean : 30, distances: 10,10,0,10,10

Clearly D will have maximum SD as distances from mean are maximum in case of D.
Hence D
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Originally posted by globaldesi on 28 Nov 2018, 20:01.
Last edited by globaldesi on 02 Dec 2018, 00:21, edited 1 time in total.
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Re: Which of the following lists has the greatest standard deviation?  [#permalink]

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New post 30 Nov 2018, 20:08
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globaldesi wrote:
Let us look at the distances of each series from mean.
A: mean = 30, distances : 20,10,0,10,20
B : mean : 37.5, distances : 27.5, 7.5,7.5,7.5 2.5
C: mean: 30, distances: 20,5,0,5,20
D: mean: 30, distances: 20,20,0,20,20
E: mean : 30, distances: 10,10,0,10,10

Clearly D will have maximum SD as distances from mean are maximum in case of D.
Hence D


Mean in B will be 30, not 27.5
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Re: Which of the following lists has the greatest standard deviation?  [#permalink]

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New post 02 Dec 2018, 00:20
styleashish20 wrote:
globaldesi wrote:
Let us look at the distances of each series from mean.
A: mean = 30, distances : 20,10,0,10,20
B : mean : 37.5, distances : 27.5, 7.5,7.5,7.5 2.5
C: mean: 30, distances: 20,5,0,5,20
D: mean: 30, distances: 20,20,0,20,20
E: mean : 30, distances: 10,10,0,10,10

Clearly D will have maximum SD as distances from mean are maximum in case of D.
Hence D


Mean in B will be 30, not 27.5


Apologies ..
my mistake it should have been 30
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Re: Which of the following lists has the greatest standard deviation?   [#permalink] 02 Dec 2018, 00:20
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Which of the following lists has the greatest standard deviation?

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