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* Toughest Average / Standard Deviation Problem

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san
 Post subject: * Toughest Average / Standard Deviation Problem
 Post Posted: Wed Jan 07, 2009 12:54 am 
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JonathanSchneider
 Post subject:
 Post Posted: Wed Jan 07, 2009 12:16 pm 
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ManhattanGMAT Staff


Posts: 380
Can you please cite the source? Otherwise we must delete.
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san
 Post subject:
 Post Posted: Thu Jan 08, 2009 12:57 am 
Hi,

This problem is from GRE PowerPrep.

I found problem interesting.
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san
 Post subject:
 Post Posted: Wed Jan 14, 2009 1:57 pm 
I can see problem is moved. What does it mean ?

What is answer ?
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JonathanSchneider
 Post subject: Re: * Toughest Average / Standard Deviation Problem
 Post Posted: Wed Feb 11, 2009 12:12 pm 
Offline
ManhattanGMAT Staff


Posts: 480
Location: Durham, NC
I moved it over here because it was in the wrong folder. Please be careful which folder you publish to. It helps us to keep things organized : )

I would agree with your choice (One). Reasoning: the -33 rating would not be possible without at least one rating of -2. Even if each respondent indicated -1, this would only total -30. The trick is to consider the -26 as well. Could this be achieved without a -2? Yes. You'd have to have a breakdown like this:

twenty-six "-1" ratings, followed by either:
four "0" ratings
or two "-1" and two "+1" ratings
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