I have searched literally over 30 websites/pages now and still no idea.

PLEASE HELP big test soon
Larrivée D-03R
US Fender Telecaster, Vox AC15
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hey, why dont you just use the formula if you cant find how to do it, takes longer but less stress. pm me if you dont know how
i know how its just i've got over 100 values and i want to use my calculator.
Larrivée D-03R
US Fender Telecaster, Vox AC15
firstly stick the calculator in statistics mode and select SD(standard deviation), input your numbers and put them in the memory, so like 12 M+, 14M+ etc etc then hit the sigma X key and it gets the standard deviation (like an o with a line on the top)