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

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Manager
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Joined: 06 Jul 2011
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Location: Accra, Ghana
What was the standard deviation of Company R's earnings per  [#permalink]

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New post 23 Apr 2012, 08:26
2
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

74% (00:22) correct 26% (00:36) wrong based on 122 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...
Manager
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Joined: 23 Oct 2011
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Location: Ukraine
Schools: LBS '14 (M)
GMAT 1: 650 Q44 V35
WE: Corporate Finance (Mutual Funds and Brokerage)
Re: What was the standard deviation of Company R's earnings/yr?  [#permalink]

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New post 23 Apr 2012, 08:32
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.

E
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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, 04:16
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, 12:29
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Re: What was the standard deviation of Company R's earnings per &nbs [#permalink] 23 Dec 2017, 12:29
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