25 Stat summations

[Matt Agajanian]

Hi all.

The 25 had eight registers. Since Σ(x^2) was calculated and stored, why was Σ(y^2) missing? Yeah, all the user had to do was x<>y x^2 STO + (register of your choice). But, why not have the 25 do that and store it in one of the remaining registers?