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Calculating the mean or sum of a set of data, or even counting the set of Buy a Casio fx-83GTX calculator on Amazon using this affiliate link to help Casio FX-9750G PLUS Manual Online: Summation (Σ) Calculations. To perform Σ calculations, first display the function analysis menu, and then input the fx-991EX Quick Start Guide. 5 summation (sigma) notation,. qxIxd+1$-3$7= …derivatives of a function at a specific point (value),. qyY4xd-5x$0.2=.What Scientific Calculator fx-991 ES can do!! Hassan El-Najjar. 1. 1. Summation of values and values square , Standard deviation for Sample and.