Find the mean of the data set
Subtract the mean from each value
Square each difference
Add all the squared differences
Divide by the number of values for population variance
Divide by the number of values minus 1 for sample variance
Take the square root of the variance to get the standard deviation
Use the population formula: σ² = Σ(x – μ)² / N
Use the sample formula: s² = Σ(x – xÌ„)² / (n – 1)
Use the population standard deviation formula: σ = √[Σ(x – μ)² / N]
Use the sample standard deviation formula: s = √[Σ(x – xÌ„)² / (n – 1)]