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: [-38.082, -75.139, -69.27, -38.847, 93.56, -74.596, 219.283, -55.333]

-4.803