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Standard Deviation Calculator
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Sample
Population
Numbers
Sample
Clear
12, 15, 18, 18, 21, 24, 25
Choose population when you have the full dataset, or sample when estimating a broader population from a subset.
Standard deviation
4.69041576
7 numbers detected
Copy result
Variance
22
Mean
19
Count
7
Sum
133
Min / Max
12 / 25
Coefficient of variation
24.69%
Formula
s = sqrt(Σ(x - x̄)² / (n - 1))