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: [-31.921, -39.036, 212.583, -44.259, 27.385, 95.851, 27.055, 153.172]

50.104