Standard Deviation Calculator
Compute mean, variance, standard deviation (sample and population), and standard error.
Population Std Dev (σ)
2
Sample Std Dev (s)
2.1381
Count (n)
8
Sum
40
Mean (x̄)
5
Pop. Variance (σ²)
4
Sample Variance (s²)
4.5714
Standard Error
0.75593
Min
2
Max
9
Range
7
Use σ for entire population; s for a sample (divides by n−1). Standard error = s/√n.