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: [-58.055, 66.398, -32.928, -11.364, -89.587, 207.334, -75.209, 174.172]

22.595