SUM, MEAN & SDEV don't lift the stack
Re: SUM, MEAN & SDEV don't lift the stack
I'm not qualified to argue about history, but I concur that pushing two results on the stack feels much more sensible from a user perspective.
DM41X #542, DM42 #650, DM41L #801, HP 41CX, HP 41CV, HP 50G, HP11C, TI 89