mode--->SD(select by pressing 1)
Shift mode(CLR) and again 1 to erase any previous statistical Data(SCL)
input the relevent data n press M+ on each interval..then after addin all the data
Shift 2 SD can be taken using either pressing 2(for over 30 data) or 3(for less than 30 data)
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go to stat mode then then select (A+BX) mode and enter the data and press AC on cal. then shift+1 and go to the stat and select REG and there you can see options like A,B and r u can select any of these to get what u need .if you want the answer for r select that option. thnx.