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: [-57.108, -16.819, 79.314, 94.108, -33.463, -14.495, -48.311, 201.396, -24.222]

20.044