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# List S: —25, —10, 0, 10, 25 The numbers in which of the fol

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List S: —25, —10, 0, 10, 25 The numbers in which of the fol [#permalink]  04 Mar 2017, 03:32
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Question Stats:

73% (00:28) correct 26% (00:22) wrong based on 34 sessions

List S: $$— 25, — 10, 0, 10, 25$$

The numbers in which of the following lists have an average (arithmetic mean) that is equal to the average of the numbers in list S ?

Indicate all such lists.

❑ —10, —5, 0, 5, 10

❑ —20, —10, 0, 10, 20

❑ —25, —20, 0, 10, 25

❑ —25, —5, 0, 5, 25
[Reveal] Spoiler: OA

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Re: List S: —25, —10, 0, 10, 25 The numbers in which of the fol [#permalink]  07 Mar 2017, 16:03
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Explanation

We know $$\frac{sum}{# of #s} = average$$.

We know from List S: —25, —10, 0, 10, 25

Sum of the list S = 0.

Answer choices (A), (B), and (D) have similar patterns, so the average of these three answer choices is also 0. The sum of choice (C) will be –10, so the average is –2.

Hence options A, B and D are correct.
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Re: List S: —25, —10, 0, 10, 25 The numbers in which of the fol   [#permalink] 07 Mar 2017, 16:03
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