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Mean Median

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Source: — Data Sufficiency |
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by GMATGuruNY » Tue Oct 19, 2010 2:49 pm
For a certain set of n numbers, where n>1, is the average (arithmetic mean) equal to the median?

(1) If the n number in the set are listed in increasing order, then the difference between any pair of successive numbers in the set is 2.

(2) The range of the n numbers in the set is 2(n-1).

Statement 1:
Tells us that the numbers in the set are all 2 apart. Whenever all the numbers in a set are equally spaced, then the average = the median. Sufficient.

Statement 2:
Tell us nothing about what sorts of numbers are in the set. Insufficient.

The correct answer is A.

Statement 1 in more depth:

Numbers that are equally spaced can be represented as n, n+x, n+2x, n+3x, etc.
Let's say that the numbers are n, n+x, and n+2x.
Average = (n+n+x+n+2x)/3 = (3n+3x)/3 = n+x, which is the median.
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by diebeatsthegmat » Fri Oct 22, 2010 7:13 am
GMATGuruNY wrote:For a certain set of n numbers, where n>1, is the average (arithmetic mean) equal to the median?

(1) If the n number in the set are listed in increasing order, then the difference between any pair of successive numbers in the set is 2.

(2) The range of the n numbers in the set is 2(n-1).

Statement 1:
Tells us that the numbers in the set are all 2 apart. Whenever all the numbers in a set are equally spaced, then the average = the median. Sufficient.

Statement 2:
Tell us nothing about what sorts of numbers are in the set. Insufficient.

The correct answer is A.

Statement 1 in more depth:

Numbers that are equally spaced can be represented as n, n+x, n+2x, n+3x, etc.
Let's say that the numbers are n, n+x, and n+2x.
Average = (n+n+x+n+2x)/3 = (3n+3x)/3 = n+x, which is the median.
hi, can you please explain more detail more the statement 1?
i dont understand its statement... statement 1 : the difference between any pair of successive numbers in the set is 2.
does it mean that if the first number is a, second number is a+2, the third number is a+4
so their pair of numbers' difference is a+2-a=2 and z+4-a-2=2??
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