Find the mean: (mu = frac{sum x}{n})
Subtract the mean from each value: (x – mu)
Square each difference: ((x – mu)^2)
Add the squared differences: (sum (x – mu)^2)
Divide by the number of values for population variance: (sigma^2 = frac{sum (x – mu)^2}{n})
Divide by one less than the number of values for sample variance: (s^2 = frac{sum (x – bar{x})^2}{n – 1})