# Calculate sigma(Xi-Xbar) in FX-82ES plus

### #1 nitish159

nitish159

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Posted 10 March 2017 - 03:55 PM

Hi, I needed to calculate sigma(Xi-Xbar) [summation of deviation of each x from its mean] as its required in many formulae like mean deviation, covariance, to name a few.

I was just wondering if there is a way to do it in Fx-82es or will I have to just manually calculate it?

Thanks

### #2 pan.gejt

pan.gejt

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Posted 11 March 2017 - 07:11 PM

Well, You can use the formulas for population standard deviation (sigma) or sample standard deviation (s). These formulas contains 3 variables and you know two variables from your calc - number of items and population standard deviation or sample standard deviation. So you are able to calculate the sum of squares.

the sum of squares = sigma^2*n

the sum of squares = s^2*(n-1)

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