New in version 1.1.
Arithmetic means of sequence as an exact integer:
abjad> from abjad.tools import mathtools
abjad> mathtools.arithmetic_mean([1, 2, 2, 20, 30])
11
As a rational:
abjad> mathtools.arithmetic_mean([1, 2, 20])
Fraction(23, 3)
As a float:
abjad> mathtools.arithmetic_mean([2, 2, 20.0])
8.0
Return number.
Changed in version 2.0: renamed sequencetools.arithmetic_mean() to mathtools.arithmetic_mean().