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If m, s are the average and standard deviation of integers a, b, c

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If m, s are the average and standard deviation of integers a, b, c [#permalink]

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Question Stats:

36% (01:43) correct 64% (00:50) wrong based on 25 sessions

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If m, s are the average and standard deviation of integers a, b, c, and d, is s > 0?

1. m > a
2. a + b + c + d = 0
[Reveal] Spoiler: OA

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Re: If m, s are the average and standard deviation of integers a, b, c [#permalink]

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New post 12 Mar 2017, 21:11
STE 1: SD can +ve or 0. if all the elements in the set are 0 then SD will be zero otherwise a +ve value. given that m>a ie avg is greater than one element. all elements are not equal .Sufficient.

STE 2 : all the elements can be 0 or a negative value + a positive value. Not sufficient

Answer : A
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Re: If m, s are the average and standard deviation of integers a, b, c   [#permalink] 12 Mar 2017, 21:11
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If m, s are the average and standard deviation of integers a, b, c

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