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s(x) is the standard deviation of a sample of data. S is the standard deviation of the entire population of your sample. If youre looking for the standard deviation or volatility of stocks, hereâs a blog which includes a table with all of the equa...
Where: 1  X is the mean. 2  Z is the Z-value from the table below. 3  s is the standard deviation.  n is the number of samples.