The variance is the average of the
squared differences from the mean.
Variance
Standard Deviation
A standard deviation is a statistic that
measures the dispersion of a dataset
relative to its mean and is calculated
as the square root of the variance.
1, 3, 5, 7, 9
-4, -2, 0, 2, 4,
16, 4, 0, 4, 16
(16 + 4 + 0 + 4 + 16) / 5 = 8
(Sqrt)8 = 2.828
Data set
Deviation
Deviation^2
Variance
Standard Deviation