Standard Deviation Calculator
Calculate standard deviation, variance, mean, median, and other statistical measures for any dataset.
Sample Standard Deviation
n = 8 data points
Mean
Distribution
Extended Statistics
Sorted Data (8 values)
Red = potential outlier (|z| > 2)
About Standard Deviation
Sample (s): Divides by n-1 (Bessel's correction). Use when data is a sample from a larger population.
Population (Ļ): Divides by n. Use when data represents the entire population.
68-95-99.7 rule: For normal distributions, ~68% of data falls within 1Ļ, ~95% within 2Ļ, and ~99.7% within 3Ļ of the mean.
Frequently Asked Questions
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