Math · Calculator
Standard Deviation Calculator
Calculate standard deviation of a dataset.
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Standard Deviation Calculator
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Measure the spread of a dataset.
Formula
σ = √(Σ(x-μ)² / (n-1))Step-by-step
- Compute mean
- Sum squared differences
- Divide by n-1
- Square root
Example
2,4,4,4,5,5,7,9 → σ ≈ 2.14.
FAQ
What is standard deviation?+
A measure of how spread out values are from the mean.
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