Median

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aatech: Master | Next Rank: 500 Posts; Posts: 192; Joined: Tue Apr 29, 2008 7:41 am; Thanked: 14 times

by aatech » Tue Jun 03, 2008 12:37 pm

What is the median value of the set R, if for every term in the set,
R (nth term) = R(n–1 th term) + 3?

(1) The first term of set R is 15.

(2) The mean of set R is 36.

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Source: Beat The GMAT — Data Sufficiency | Tue Jun 03, 2008 12:37 pm

amitansu: Master | Next Rank: 500 Posts; Posts: 294; Joined: Tue Feb 26, 2008 9:05 pmFollowed by: 1 member; Thanked: 13 times

by amitansu » Tue Jun 03, 2008 9:08 pm

Is ans C here !!

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netigen: Legendary Member; Posts: 631; Joined: Mon Feb 18, 2008 11:57 pmFollowed by: 3 members; Thanked: 29 times

by netigen » Tue Jun 03, 2008 9:22 pm

Ans is D

(A) is sufficient as we compute the complete series and then the median
(B) in an equally distributed set median = mean so sufficient

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molt_llest: Senior | Next Rank: 100 Posts; Posts: 69; Joined: Sat May 10, 2008 3:05 pm; Thanked: 1 times

by molt_llest » Tue Jun 03, 2008 11:33 pm

netigen wrote:Ans is D

(A) is sufficient as we compute the complete series and then the median
(B) in an equally distributed set median = mean so sufficient

I think the answer is B because in (a) we need to now "n" in order to know the median.

(a)For instance: 15, 18, 21 -> median=18 and 15,18,21,24,27 -> median 21.

(b) mean 36 then n=1, R=(36)->median 36; n=3, R=(33,36,39) median 36; n=5, R=(31, 33, 36,39,42)-> median 36

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netigen: Legendary Member; Posts: 631; Joined: Mon Feb 18, 2008 11:57 pmFollowed by: 3 members; Thanked: 29 times

by netigen » Tue Jun 03, 2008 11:37 pm

my bad, you are right A is not sufficient only B is sufficient.

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aatech: Master | Next Rank: 500 Posts; Posts: 192; Joined: Tue Apr 29, 2008 7:41 am; Thanked: 14 times

by aatech » Wed Jun 04, 2008 9:38 am

OA is B

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