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Median/Mean - GMATPREP

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beater: Master | Next Rank: 500 Posts; Posts: 301; Joined: Tue Apr 22, 2008 6:07 am; Thanked: 2 times

by beater » Thu Mar 05, 2009 6:20 pm

if the average mean of the five numbers x,7,2,16 and 11 is equal to the median of the five numbers, what is the value of x?

1. 7<x<11
2. x is the median of the five numbers

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Source: Beat The GMAT — Data Sufficiency | Thu Mar 05, 2009 6:20 pm

pakaskwa: Master | Next Rank: 500 Posts; Posts: 107; Joined: Wed Mar 04, 2009 4:39 am; Location: Vancouver; Thanked: 9 times; GMAT Score:750

by pakaskwa » Thu Mar 05, 2009 6:42 pm

Answer is D.

Stmt 1 says 7<x<11, it means x is the median. So we got:
2, 7, x, 11, 16
2+7+x+11+16=5x
x=9
Sufficient

Stmt 2 is exactly the same as stmt 1. Sufficient.

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