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πŸ“Š Standard Deviation Calculator

Calculate population and sample standard deviation, variance, and related statistics for any dataset.…

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Standard Deviation Calculator β€” Guide & Formulas

Standard deviation measures how spread out values are around the mean. A small SD means values cluster tightly; a large SD means wide spread. Population SD (Οƒ) uses N; sample SD (s) uses Nβˆ’1 (Bessel's correction) to account for sampling bias. In a normal distribution, 68% of values fall within 1 SD of the mean, 95% within 2 SD, 99.7% within 3 SD.

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