SOURCE: Calculate true population mean and
Here are some tuts with the formulas to do it.
http://stattrek.com/Lesson4/Mean.aspx?Tutorial=Stat
once the mean is determined you can calculate the deviation
http://hubpages.com/hub/stddev
SOURCE: Which button do I use for the square root button?
The square root button is two up from the 9 key, just to the left of the divide key. To calculate the square root of 2, for example, press 2 square-root =
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