Standard Deviation Calculator
Calculate mean, variance, and both population and sample standard deviation from any list of numbers — separated by commas, spaces, or new lines.
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About the Standard Deviation Calculator
Standard deviation measures how spread out a set of numbers is around the mean. A small standard deviation means values cluster close to the average; a large one means they're widely scattered.
Use the population formula (σ) when your data represents the entire population, and the sample formula (s) when your data is a sample drawn from a larger population — the sample formula divides by n−1 to correct for bias.
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