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How many elements are there in Set A? 1) Frequency of each element in

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How many elements are there in Set A? 1) Frequency of each element in [#permalink]

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New post 05 Oct 2017, 07:08
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44% (00:30) correct 56% (00:08) wrong based on 27 sessions

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How many elements are there in Set A?

1) Frequency of each element in the set A is 1
2) Standard Deviation of Set A is NOT Positive

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

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How many elements are there in Set A? 1) Frequency of each element in [#permalink]

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New post 05 Oct 2017, 07:46
GMATinsight wrote:
How many elements are there in Set A?

1) Frequency of each element in the set A is 1
2) Standard Deviation of Set A is NOT Positive

Source: http://www.GMATinsight.com


Statement 1:set can be {1,2,3...} or {1}. in either case frequency is 1 but no of elements are different. Hence insufficient

Statement 2: implies St. Dvi is 0 because standard deviation cannot be negative, it is either positive or 0. Note standard deviation is the square root of variance, hence cannot be negative. so in Set A all elements are equal i.e {1,1,1,1....} or {1}. In either case no of elements are different. hence Insufficient

Combining 1 & 2,it is clear that the set A has only One element. Hence Sufficient

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How many elements are there in Set A? 1) Frequency of each element in   [#permalink] 05 Oct 2017, 07:46
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