in the example 17,18,19,20,21,22,23 you do the greek letter that looks similar to an E and it has a plus sign next to it so 17e+ 18E+ 19E+ 20E+ 21E+ 22E+ 23E+ if you have more then one occurance for that particular number you put 2nd then freq and input the number of times it occurs. if not then you finish by pressing the 2nd oxn-1 and then the square root button. and thats you standard deviation.
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