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

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Manager
Joined: 06 Jul 2011
Posts: 205
Location: Accra, Ghana
What was the standard deviation of Company R's earnings per  [#permalink]

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23 Apr 2012, 07:26
2
00:00

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...
Intern
Joined: 23 Oct 2011
Posts: 43
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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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.

E
Intern
Joined: 29 Feb 2012
Posts: 9
Re: What was the standard deviation of Company R's earnings per  [#permalink]

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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.
Non-Human User
Joined: 09 Sep 2013
Posts: 9879
Re: What was the standard deviation of Company R's earnings per  [#permalink]

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23 Dec 2017, 11:29
Hello from the GMAT Club BumpBot!

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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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