I am creating a spreadsheet to help me quickly calculate my CVs for grip strength testing and graphing for bell curve analysis. What values do I use when graphing? Do I use CVs or other data?  Also, I am trying to calculate standard deviation to interpret the bell curve ( as far as > or < 7.5 lbs). Do I take the square root of the sum of all the standard deviations of each handle position. I am getting confused with this calculation.

Any help is greatly appreciated as we do not have the software to calculate for me.