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def average_absolute_deviation(nums: list[int]) -> float:

"""

Return the average absolute deviation of a list of numbers.

Wiki: https://en.wikipedia.org/wiki/Average_absolute_deviation

>>> average_absolute_deviation([0])

0.0

>>> average_absolute_deviation([4, 1, 3, 2])

1.0

>>> average_absolute_deviation([2, 70, 6, 50, 20, 8, 4, 0])

20.0

>>> average_absolute_deviation([-20, 0, 30, 15])

16.25

>>> average_absolute_deviation([])

Traceback (most recent call last):

...

ValueError: List is empty

"""

if not nums: # Makes sure that the list is not empty

raise ValueError("List is empty")

average = sum(nums) / len(nums) # Calculate the average

return sum(abs(x - average) for x in nums) / len(nums)

if __name__ == "__main__":

import doctest

doctest.testmod()