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The information is all from 2 websites (asides from the summary). I have
copied it into this document so that you can obtain the method more simply.
This isn't actually my own work, but I found the following information very
Information from:

Standard Deviation…

Page 2

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2. Substract the mean from every number in the list, to get deviations. This
calculates how far they are from the mean.
3. Square the deviations.
4. Add the deviations together.
5. Divide the total value for all the deviations by one less than the number


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