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If each of the average ratings was the arithmetic mean of th

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Joined: 18 Apr 2015
Posts: 6874
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Kudos [?]: 1332 [0], given: 6293

If each of the average ratings was the arithmetic mean of th [#permalink]  24 Jan 2017, 07:41
Expert's post
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Question Stats:

81% (01:56) correct 18% (02:38) wrong based on 27 sessions

Attachment:

GRE - powerprep In a survey, 100 travel agents each ranked Airlines A, B, and C in order of preference..jpg [ 51.87 KiB | Viewed 4813 times ]

If each of the average ratings was the arithmetic mean of the ratings given by 100 travel agents, approximately how much greater was the total of the ratings given to all three airlines for reliability than that for promptness?

A) 25

B) 50

C) 125

D) 250

E) 500
[Reveal] Spoiler: OA

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GRE Prep Club Legend
Joined: 07 Jun 2014
Posts: 4810
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 117

Kudos [?]: 1895 [2] , given: 397

Re: If each of the average ratings was the arithmetic mean of th [#permalink]  28 Jan 2017, 06:56
2
KUDOS
Expert's post
Explanation

We start by computing sums of each category and find difference.

 Category A B C Total Promptness 6.5 6.9 4.1 17.5 Reliability 7.8 7.5 4.9 20.2 Difference: 2.7

Finally, multiply this number by the 100 travel agents: $$2.7 \times 100 = 270$$

The question asks for an approximate number and the closest is 250.

Hence option D is correct.
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Sandy
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