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math / Free Online Tool
Standard Deviation Calculator.
Compute mean, variance, population standard deviation, and sample standard deviation from lists of values.
Input Parameters
Computed Results
Primary Metric
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Comments & Feedback.
Frequently asked questions.
What is the difference between population and sample standard deviation?
Population SD divides by N (total count), while sample SD divides by N-1 (Bessel's correction). Use sample SD when analyzing a subset of a larger population, and population SD when you have data for the entire group.
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