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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...
The standard deviation of x-bar is the population standard deviation ($300) divided by the square root of the sample size. The sample size is 100, so its square root is 10. $300/10 = $30.