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Weekly Revenue Per Product Category at Office Supply Store X

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GMAT Club Legend
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Joined: 07 Jun 2014
Posts: 4709
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
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Weekly Revenue Per Product Category at Office Supply Store X [#permalink] New post 29 Aug 2018, 16:23
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Question Stats:

87% (01:29) correct 12% (00:00) wrong based on 8 sessions
Weekly Revenue Per Product Category at Office Supply Store X





Product CategoryWeekly Revenue
Pens$164
Pencils$111
Legal pads$199
Erasers$38
Average (arithmetic mean) of categories above$128


According to the chart above, the average (arithmetic mean) revenue per week per product category is $128. However, there is an error in the chart; the revenue for Pens is actually $176, not $164. What is the new, correct average revenue per week per product category?

(A) $130
(B) $131
(C) $132
(D) $164
(E) $176
[Reveal] Spoiler: OA

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Re: Weekly Revenue Per Product Category at Office Supply Store X [#permalink] New post 30 Aug 2018, 00:10
Prior change the average is 128 for 4 products. Hence total sum = 128*4 = 512
However, there was a mistake $12 should be added to make the new sum 524 and the new average = 524/4 = $131
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Re: Weekly Revenue Per Product Category at Office Supply Store X   [#permalink] 30 Aug 2018, 00:10
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Weekly Revenue Per Product Category at Office Supply Store X

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