so I have 3 data sets, which all came from the first data set using the excel program. all consisted of random numbers from =randbetween(0,100) starting from A2:A102 which is 100 integers. for data set b I had to enter=SUM(A2+5) press enter and drag it down to get the integers for cells B2:B102 and for C I had to do multiplication t get it. I did =PRODUCT(A2:A102*5). so everything was taken from data set A. now I did the formulas needed to do sample standard dev and mean(average) . for data set a and b the standard deviations were the same but the mean was larger in data set B of course because I added 5 to each cell in set A. my question is why wouldn't the standard deviation be the same for data set C also? if im using the info from data set A? and how do I calculate the standard deviation (sample) by hand so I can explain why the standard dev doesn't change but the mean does. I don't know what numbers to include in the formula for sample standard deviation.