Casio Fx-50fh Ii User Manual -

If you follow the manual for Standard Deviation, it works, but it is slow.

Support for complex number calculations, fractions, combinations, permutations, and 40 scientific constants. Built-in Formulas: casio fx-50fh ii user manual

Enter your formula using the alpha keys (e.g., ALPHA A + ALPHA B ). If you follow the manual for Standard Deviation,