Definition: In this task you will be given a list of numbers and you need to find the mean (average) of that list. The mean of a list can be found by summing every number in the list then dividing the result by the size of that list. The output should be rounded to 3 decimal places.
Input: [-18.763, 211.572, 124.021, -2.526, -44.499, 75.194, 64.18, 62.486]

58.958