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Ave and Median

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Source: — Data Sufficiency |
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Re: Ave and Median

by piyush_nitt » Sat May 02, 2009 4:13 pm
ebehboud wrote:If the average of five numbers, x, 7, 2, 16, and 11 = the median, what is x?
a. 7 < x > 11
b. x is median of the five numbers
IMO A

A. x can be 8,9,10.

But only when x = 9 , mean = median

B. Insufficient.
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by aj5105 » Sat May 02, 2009 8:03 pm
IMO (D)

Statement (2) is same as Statement (1)
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by awesomeusername » Sat May 02, 2009 10:44 pm
I think you mean 7<x<11 right?

(A) implies that x=9, since x has to be the median (middle) number and must also be the average. Since 9 has numbers "evenly-spaced" on its left and right, it's the average too.

(B) if x is the median and average, then x must be 9.

So (D) IMO
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