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by tracyyahoo » Mon Oct 03, 2011 1:03 am
The average (arithematic mean) of a list of numbers is what percent of the sum of the numbers?

(1) There are 8 numbers in the list
(2) The sum of the numbers in the list is 100

I Chose C, but unbelieveablly the answer is A, why the hell is that???? Pls explain me. Thank you
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Source: — Data Sufficiency |
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by shankar.ashwin » Mon Oct 03, 2011 1:11 am
Average = Total / No. of Numbers

From (1) No of numbers = 8

Avg = Total / 8 (which is 12.5% of total)

Sufficient

From (2) Total is given, but we dont know No. of numbers.

Hence A
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by GmatKiss » Mon Oct 03, 2011 9:50 am
as simple as ashwin explained!

IMO:A
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by gmatboost » Mon Oct 03, 2011 10:44 am
Perhaps re-arrange to emphasize the quantity we are looking for:
The average (arithematic mean) of a list of numbers is what percent of the sum of the numbers?
Average = x% * Sum
x% = Average/Sum

St 1: There are 8 numbers in the list.
Average = Sum/8 --> Divide by Sum
Average/Sum = 1/8 = x%
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