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: [-83.175, -58.082, -44.737, 226.0, 148.21, 120.237, -6.499, 167.991, 202.312]

74.695