Standard Deviation

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amsm25: Junior | Next Rank: 30 Posts; Posts: 28; Joined: Thu Jul 28, 2011 11:53 am

Standard Deviation

by amsm25 » Thu May 17, 2012 7:42 pm

A set consists of 5 no's - 0,2,4,6,8. Which no's if added to creat a set of 7 no's will result in new SD closest to the SD of original 5 no's?

a)-1,9
b)4,4
c)3,5
d)2,6
e)0,8

OA- d)2,6

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Source: Beat The GMAT — Problem Solving | Thu May 17, 2012 7:42 pm

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pm; Location: Milpitas, CA; Thanked: 1854 times; Followed by:523 members; GMAT Score:770

by Anurag@Gurome » Thu May 17, 2012 7:57 pm

amsm25 wrote:A set consists of 5 no's - 0,2,4,6,8. Which no's if added to creat a set of 7 no's will result in new SD closest to the SD of original 5 no's?

a)-1,9
b)4,4
c)3,5
d)2,6
e)0,8

OA- d)2,6

I don't think this is a real GMAT question because mostly GMAT does not require the actual calculation of S.D. What's the source?