Find the population mean: ( mu = frac{sum x}{N} )
Subtract the mean from each data value: ( x – mu )
Square each difference: ( (x – mu)^2 )
Add all squared differences: ( sum (x – mu)^2 )
Divide by the population size: ( sigma^2 = frac{sum (x – mu)^2}{N} )
Use ( sigma^2 ) as the population variance