Is this a GMAT Type ?

Expert replies

Uva@90: Master | Next Rank: 500 Posts; Posts: 489; Joined: Thu Jul 04, 2013 7:30 amFollowed by: 5 members; Location: Chennai, India; Thanked: 83 times

by Uva@90 » Sun Nov 03, 2013 6:53 pm

A set of data consists of the following 5 numbers: 0,2,4,6, and 8. Which two numbers, if added to create a set of 7 numbers, will result in a new standard deviation that is close to the standard deviation for the original 5 numbers?
(A) -1 and 9
(B) 4 and 4
(C) 3 and 5
(D) 2 and 6
(E) 0 and 8
Answer: D.

I ended up with option c and d, by eliminating all others as they affect the SD widely.
But how to select One from C and D.

Thanks in advance.

Regards,
Uva.

Known is a drop Unknown is an Ocean

Source: Beat The GMAT — Problem Solving | Sun Nov 03, 2013 6:53 pm

GMAT/MBA Expert

Brent@GMATPrepNow: GMAT Instructor; Posts: 16206; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Sun Nov 03, 2013 10:18 pm

I think that this question requires FAR TOO many calculations to be GMAT-worthy.

Having said that, I did provide two (painfully long) solutions here: https://www.beatthegmat.com/bad-at-stati ... 18488.html

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

GMAT/MBA Expert

[email protected]: Elite Legendary Member; Posts: 10391; Joined: Sun Jun 23, 2013 6:38 pmFollowed by: 511 members; Location: Palo Alto, CA; Thanked: 2867 times; GMAT Score:800

by [email protected] » Sun Nov 03, 2013 11:13 pm

Hi Uva@90,

NO, this question is not something that is GMAT-like. While the GMAT will ask you about Standard Deviation, you will NOT be asked to calculate it. Instead, you'll be asked a question (likely just 1) that tests your knowledge of the basic concept.

GMAT assassins aren't born, they're made,
Rich

Contact Rich at [email protected]

Uva@90: Master | Next Rank: 500 Posts; Posts: 489; Joined: Thu Jul 04, 2013 7:30 amFollowed by: 5 members; Location: Chennai, India; Thanked: 83 times

by Uva@90 » Mon Nov 04, 2013 8:11 pm

Thanks Brent/ Rich for your answer.

Regards,
Uva.

Known is a drop Unknown is an Ocean

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