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Standard Deviation Calculator
Calculate the population and sample standard deviation, mean, variance, and count for any set of numbers. Enter your data as comma-separated values.
Frequently asked questions
What is standard deviation?
Standard deviation measures how spread out numbers are from the mean.
When do I use sample vs population standard deviation?
Use population SD (σ) when you have data for the entire population. Use sample SD (s) when your data is a sample from a larger population.
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