METHOD
How this tool works
Standard deviation measures how far values typically spread from their mean.
CALCULATORS
Standard Deviation Calculator
Calculate mean, variance and standard deviation.
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Mean
Variance
Standard deviation
Count
EXAMPLE
A quick check
The values 2, 4, 4, 4, 5, 5, 7, 9 have population standard deviation 2.
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Quick answers
Population or sample?
Choose population for the full set or sample when estimating a larger population.
How can values be separated?
Use spaces, commas or new lines.