Standard Deviation Calculator
Calculate standard deviation, variance, mean, median, and mode from a set of numbers
Frequently Asked Questions
What is the difference between population and sample standard deviation?
Population standard deviation divides by N (total count), while sample standard deviation divides by N-1 (Bessel's correction). Use sample when working with a subset of data.
What does standard deviation tell us?
Standard deviation measures how spread out numbers are from the mean. A low value means data points cluster near the mean, while a high value means they are more spread out.
What is variance?
Variance is the square of the standard deviation. It represents the average of the squared differences from the mean.