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: [-72.672, 36.449, 4.256, 145.797, 103.187, 208.111, 108.054, -44.634, 173.476, 170.388]

83.241