Standard Deviation Calculator

Standard deviation measures how spread out a set of numbers is from their mean.

Inputs
Results
Mean
3.8
Population Standard Deviation
0.98

Try an example

Formula

σ = √(Σ(x − mean)² / N)

Learn How This Works

How Standard Deviation Measures Spread, Explained

The standard deviation formula worked through step by step, showing exactly what each part of the calculation represents.

Frequently Asked Questions

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