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Standard Deviation Tutorials

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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Source: — Quantitative Reasoning |
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by gabriel » Fri Feb 20, 2009 5:14 pm
Believe me the only thing you need to know about standard deviation for the GMAT is its formula and its definition.
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by marouan » Mon Feb 23, 2009 8:05 am
This picture explain to you what you really need to know for the GMAT:
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