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.
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Is this a GMAT Type ?
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Brent@GMATPrepNow
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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
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
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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
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
