amirhakimi wrote:
For age ranging from 12 (A=12) to 30, the average mass is within which of the following?
A)1000 to 2000
B)2000 to 3000
C)3000 to 4000
D)4000 to 5000
E)5000 to 6000
Answer is
D
Ages 12-20:
For these 9 ages, the graph seems symmetrical about point B, which corresponds to a mass of 3000.
Implication:
The average mass for these 9 ages is about 3000.
Approximate SUM of these 9 masses = (number)(average) = 9*3000 = 27,000.
Ages 21-30:
For these 10 ages, the corresponding masses are all around 5500, as indicated by the points to the right of point C on the graph.
Approximate SUM of these 10 masses = (number)(average) = 10*5500 = 55,000.
Resulting average:
Approximate AVERAGE of all 19 masses = sum/number = (27000+55000)/19 = 82000/19 ≈ 4300.
The correct answer is
D.
Last edited by
GMATGuruNY on Mon Nov 25, 2013 7:56 am, edited 2 times in total.
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