Calculate standard deviation, variance, and mean for your data set. Free statistical tool with step-by-step calculations and explanations.
Enter comma-separated numbers to calculate standard deviation, variance, mean, and more.
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Standard deviation measures how spread out numbers are from the mean. Our calculator handles both sample and population standard deviation.
What is the difference between sample and population standard deviation?
Sample standard deviation uses n-1 in the denominator (Bessel's correction) to estimate population parameters. Population standard deviation uses N. Use sample when your data is a subset of a larger population.