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Set A consists of 30 numbers, the average of which is 60. Se

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Set A consists of 30 numbers, the average of which is 60. Se [#permalink] New post 16 Oct 2017, 08:29
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Set A consists of 30 numbers, the average of which is 60. Set B consists of 29 numbers, the average of which is 70.

Quantity A
Quantity B
The average of Set A and B
65



(A) The quantity in Column A is greater
(B) The quantity in Column B is greater
(C) The two quantities are equal
(D) The relationship cannot be determined from the information given


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[Reveal] Spoiler: OA
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Re: Set A consists of 30 numbers, the average of which is 60. Se [#permalink] New post 16 Oct 2017, 09:21
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We are asked for a weighted average, thus the mean of set A and B is \(\frac{30*60+29*70}{59} = 64.92\).

Then column B is greater
Re: Set A consists of 30 numbers, the average of which is 60. Se   [#permalink] 16 Oct 2017, 09:21
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Set A consists of 30 numbers, the average of which is 60. Se

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