maths.weighted_average

Functions

weighted_average(→ float)

Return the weighted average of a list of values given their corresponding weights.

Module Contents

maths.weighted_average.weighted_average(values: list[float], weights: list[float]) → float

Return the weighted average of a list of values given their corresponding weights.

https://en.wikipedia.org/wiki/Weighted_arithmetic_mean

>>> weighted_average([1, 2, 3], [1, 1, 1])
2.0
>>> weighted_average([10, 20, 30], [1, 2, 3])
23.333333333333332
>>> weighted_average([5, 15], [1, 3])
12.5
>>> weighted_average([100], [0.5])
100.0
>>> weighted_average([], [])
Traceback (most recent call last):
    ...
ValueError: Inputs cannot be empty
>>> weighted_average([1, 2], [1])
Traceback (most recent call last):
    ...
ValueError: Values and weights must have the same length
>>> weighted_average([1, 2, 3], [0, 0, 0])
Traceback (most recent call last):
    ...
ValueError: Sum of weights cannot be zero