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: [107.607, 164.81, 4.043, 166.931, 67.604, 63.21, -12.837, -45.435, -82.499]

48.159