📉 Standard Deviation Calculator

Population standard deviation (σ)

2

Variance (σ²)

4

Mean

5

Count

8

Sum of squares

32

Coefficient of variation

40%

Step by step

1. Mean: 40 ÷ 8 = 5
2. Subtract the mean from each value and square the result (see the table below)
3. Add the squares: Σ(x − mean)² = 32
4. Divide by N = 8: variance = 32 ÷ 8 = 4
5. Take the square root: σ = √4 = 2