Median and Mean

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thegr81: Newbie | Next Rank: 10 Posts; Posts: 5; Joined: Sat Apr 04, 2009 7:21 am; Thanked: 1 times

by thegr81 » Sat Jul 25, 2009 12:24 am

What is the median value of the set R, if for every term in the set, Rn = Rn–1 + 3?

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

(2) The mean of set R is 36.

Correct Answer is B

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Source: Beat The GMAT — Data Sufficiency | Sat Jul 25, 2009 12:24 am

rahulmehra13: Senior | Next Rank: 100 Posts; Posts: 38; Joined: Wed Jul 22, 2009 8:49 am; Thanked: 4 times

by rahulmehra13 » Sat Jul 25, 2009 12:56 am

Stmnt 1:

Insufficient
We just have the first no = 15
the series would be like 15,18,21,24,27 .. but we don't know whats the last number so can't calculate Median.

Stmnt 2:

Sufficient
Coz in an AP ( Rn = Rn-1 + 3), Median = Mean.
Mean is given, median will be the same i.e. 36.

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