GRE Sample Test 3 Quantitative Reasoning 2

15 - 17
Number of People Subscribing to Website X, by Region 2003 - 2007

Questions 15–17 refer to the figure above.

Question : 17 of 20

Marks: +1, -0

In 2007, each subscriber spent an average of approximately 1,210 minutes per year on the website. In 2008, each subscriber spent an average of approximately 1,400 minutes per year on the website. For 2007 and 2008 combined, what was the average number of minutes per year that a subscriber spent on the website?

Your Answer:

Validate

Solution:

Use the weighted average formula: (average of 2007) × (weight of 2007) + (average of 2008) × (weight of 2008). We are given the averages,so let’s find the weights. The weight of 2007 is approximately

{55}/(55+72)

= 43.
The weight of 2008 is thus approximately .57. Now, use the formula: 1,210(.43) + 1,400(.57) = 524 + 798 = 1,322.

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