GRE Sample Test 3 Quantitative Reasoning 1

15 - 17
Questions 15–17 refer to the figures above.
Stated Order of Preference of Phones X , Y and Z

Total ratings : 1000
Ratings for Different Features Phones X , Y and Z

	Usability	Value	Appearance
X	4.2	3.8	4.0
Y	3.7	4.0	3.6
Z	4.1	4.8	4.2

Question : 16 of 20

Marks: +1, -0

The total number of points assigned to phone Z for value was what percent greater than the number of points assigned to phone Y for value?

16.66%
20%
22.2%
25%
33.3%

Validate

Solution:

Since these ratings are averages, you may be inclined to get the sum of the value ratings for each, and then use the percentage change formula.However, we don’t need to get the sum, since the number of ratings is the same for both groups. Instead, use the average rating in the percent change formula:

{4.8-4.0}/{4.0} 100

= 20%

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