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Is this a GMAT Type ?

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.

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Uva.
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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

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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.

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by Uva@90 » Mon Nov 04, 2013 8:11 pm
Thanks Brent/ Rich for your answer.

Regards,
Uva.
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