Standard Deviation Calculator
Calculate the standard deviation and variance of a list of numbers.
Standard deviation
13.4907
Variance
182.0000
Mean
18.0000
Count
6
Comment ça marche
Computes the mean, then the average squared distance of each value from the mean (variance), and takes its square root.
Sample vs. population — which should I use?
Use sample if your numbers are a subset of a larger group; use population if they represent the entire group.