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: [36.34, -16.727, 140.541, 127.454, -94.11, -74.52, 96.179, -9.121, -65.54]

15.611