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Mean of a set

Author Message
Director
Status: Finally Done. Admitted in Kellogg for 2015 intake
Joined: 25 Jun 2011
Posts: 532

Kudos [?]: 4218 [0], given: 217

Location: United Kingdom
GMAT 1: 730 Q49 V45
GPA: 2.9
WE: Information Technology (Consulting)

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17 Nov 2011, 16:39
00:00

Difficulty:

(N/A)

Question Stats:

67% (01:05) correct 33% (00:35) wrong based on 11 sessions

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What is the minimum percentage increase in the mean of set X {-4, -1, 0, 6, 9} if its two smallest elements are replaced with two different primes?
(A) 25%
(B) 50%
(C) 75%
(D) 100%
(E) 200%

OA is not provided. But I got D. Is D the right answer?
_________________

Best Regards,
E.

MGMAT 1 --> 530
MGMAT 2--> 640
MGMAT 3 ---> 610
GMAT ==> 730

Kudos [?]: 4218 [0], given: 217

Manager
Joined: 07 Aug 2011
Posts: 58

Kudos [?]: 23 [0], given: 1

Concentration: Entrepreneurship, Finance
GPA: 3.87
Re: Mean of a set [#permalink]

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17 Nov 2011, 17:29
I do also. The given set comes to an average of 2 and the smallest *different* primes you can substitute would be 2 and 3. That would bring the new average to 4. Of course, 4 is 200% of 2, but it's just a 100% increase.

Kudos [?]: 23 [0], given: 1

Senior Manager
Status: D-Day is on February 10th. and I am not stressed
Affiliations: American Management association, American Association of financial accountants
Joined: 12 Apr 2011
Posts: 252

Kudos [?]: 370 [0], given: 52

Location: Kuwait
Schools: Columbia university
Re: Mean of a set [#permalink]

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18 Nov 2011, 01:37
I go with D....

1st average is 2
2nd average is 4

percentage increase:
4-2/2*100= 2/2*100=1*100=100%

hope that helps
_________________

Sky is the limit

Kudos [?]: 370 [0], given: 52

Re: Mean of a set   [#permalink] 18 Nov 2011, 01:37
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