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# The standard deviation of which of the following is equivalent to that

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Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 6639
GMAT 1: 760 Q51 V42
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The standard deviation of which of the following is equivalent to that  [#permalink]

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01 Dec 2016, 01:06
00:00

Difficulty:

15% (low)

Question Stats:

75% (00:19) correct 25% (00:34) wrong based on 63 sessions

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The standard deviation of which of the following is equivalent to that of {m, r, p, n}?

A. $${2m, 2r, 2p, 2n}$$
B. $${m+2, r+2, p+2, n+2}$$
C. $${|m|, |r|, |p|, |n|}$$
D. $${1/m, 1/r, 1/p, 1/n}$$
E. {$$m^2, r^2, p^2, n^2$$}

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"Only $99 for 3 month Online Course" "Free Resources-30 day online access & Diagnostic Test" "Unlimited Access to over 120 free video lessons - try it yourself" Intern Joined: 26 Jun 2016 Posts: 3 Re: The standard deviation of which of the following is equivalent to that [#permalink] ### Show Tags 01 Dec 2016, 07:25 Choice B Parallel movement rule applies here. d={m,r,p,n}={m+2,r+2,p+2,n+2} The distance between each point is the same Sent from my iPhone using GMAT Club Forum mobile app Math Revolution GMAT Instructor Joined: 16 Aug 2015 Posts: 6639 GMAT 1: 760 Q51 V42 GPA: 3.82 Re: The standard deviation of which of the following is equivalent to that [#permalink] ### Show Tags 05 Dec 2016, 00:35 ==> Parallel translation doesn’t change the standard deviation. Therefore, the answer is B. In other words, each elements of B moves +2 in parallel, so the standard deviation doesn’t change. Answer: B _________________ MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only$99 for 3 month Online Course"
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Joined: 30 Oct 2018
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Re: The standard deviation of which of the following is equivalent to that  [#permalink]

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24 Nov 2018, 10:53
Property question-
In B sd will not change- (B)
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Re: The standard deviation of which of the following is equivalent to that &nbs [#permalink] 24 Nov 2018, 10:53
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