Standard Deviation Calculator
Enter a list of numbers to calculate their (population) standard deviation and variance.
Formula
Variance = average of squared differences from the mean. Standard Deviation = √Variance.
Example
The standard deviation of 2, 4, 4, 4, 5, 5, 7, 9 is 2.
Frequently Asked Questions
- Is this population or sample standard deviation?
- This calculates population standard deviation (dividing by n). Sample standard deviation (dividing by n−1) will be slightly higher for the same data.
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