Standard Deviation / Mean / Median

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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by dmateer25 » Sun Jun 07, 2009 5:41 pm
Here is some basic info on mean, median, and mode.

https://www.purplemath.com/modules/meanmode.htm

This next link is about mean and median of consecutive and evenly spaced integers. This is something you definitely should know for the GMAT.

https://businessmajors.about.com/od/gmat ... Ttest1.htm