prob140.Table.var

Table.var()

Finds variance of distribution

Returns:

float

Variance

Examples

>>> dist = Table().values([1, 2, 4]).probability([0.5, 0.4, 0.1])
>>> dist.var()
0.81
>>> (1 * 0.5 + 4 * 0.4 + 16 * 0.1) - (1.7) ** 2
0.81