"""
Lösung des Katas: Mean Square Error von kylehill
Link zum Kata: https://www.codewars.com/kata/51edd51599a189fe7f000015

"""


def solution(array_a, array_b):
    numbers_list = list(zip(array_a, array_b))
    differences = [x[0] - x[1] for x in numbers_list]
    mean_square_error = sum([x * x for x in differences]) / len(differences)

    return mean_square_error