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What was the standard deviation of Company R's earnings per

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Manager
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What was the standard deviation of Company R's earnings per  [#permalink]

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New post 23 Apr 2012, 07:26
2
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

70% (00:50) correct 30% (00:55) wrong based on 125 sessions

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What was the standard deviation of Company R's earnings per month for last year?

(1) The standard deviation of Company R's earnings per month in the first half of last year was $2.3 million

(2) The standard deviation of Company R's earnings per month in the second half of last year was $3.9 million


My last GMAT Math Question for the day hopefully...
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Re: What was the standard deviation of Company R's earnings/yr?  [#permalink]

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New post 23 Apr 2012, 07:32
A) St Dev is given only for 1H. NOT SUFFICIENT
B) St Dev is given only for 2H. NOT SUFFICIENT

A+B - we cannot simply take the average of st dev of two halves. We need earnings for each month. NOT SUFFICIENT.

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Re: What was the standard deviation of Company R's earnings per  [#permalink]

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New post 25 Apr 2012, 03:16
I agree the anwser is E as the std deviation for the uear cannot be obtained by teh arithmetic mean of the two given std deviations.
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Re: What was the standard deviation of Company R's earnings per  [#permalink]

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New post 23 Dec 2017, 11:29
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Re: What was the standard deviation of Company R's earnings per   [#permalink] 23 Dec 2017, 11:29
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