[Cl‚àë] clears the statistical registers. Always press this before starting a new calculation.
[ ‚àë+] takes the value in the x register and calculates the sum and sum of squares. The variable count is incremented and displayed in the big register under the calculator. Click [inv] before [ ‚àë+] and the value in x is removed from the calculation.
[Stat] puts the average (mean) into x and the unbiased standard deviation into y, and the variance (unbiased) into z.
[Sh‚àë] (Show stat registers) puts the sum into t (top register) and the sum of squares into z. The count remains displayed in the big register.