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Mean of a set

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Director
Director
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Status: Preparing for the 4th time -:(
Joined: 25 Jun 2011
Posts: 562
Location: United Kingdom
Concentration: International Business, Strategy
GMAT Date: 06-22-2012
GPA: 2.9
WE: Information Technology (Consulting)
Followers: 13

Kudos [?]: 525 [0], given: 217

Mean of a set [#permalink] New post 17 Nov 2011, 15:39
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

67% (02:05) correct 33% (00:35) wrong based on 11 sessions
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?
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Best Regards,
E.

MGMAT 1 --> 530
MGMAT 2--> 640
MGMAT 3 ---> 610 :-(

Manager
Manager
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Joined: 06 Aug 2011
Posts: 60
Concentration: Entrepreneurship, Finance
GPA: 3.87
Followers: 0

Kudos [?]: 4 [0], given: 1

Re: Mean of a set [#permalink] New post 17 Nov 2011, 16:29
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.
Senior Manager
Senior Manager
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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: 276
Location: Kuwait
Schools: Columbia university
Followers: 4

Kudos [?]: 60 [0], given: 52

Re: Mean of a set [#permalink] New post 18 Nov 2011, 00:37
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

Re: Mean of a set   [#permalink] 18 Nov 2011, 00:37
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Mean of a set

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