Std Deviation Equation. The formula explained step 1. Subtract the mean and square the result.
Square each deviation from the mean multiply. In the formula above μ the greek letter mu is the mean of all our values. In sample standard deviation it s divided by the number of data points minus one n 1.
Then for each number.
Sum d8 d20 in cell g10. Its symbol is σ the greek letter sigma the formula is easy. It is the square root of the variance. .
