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: [-93.675, 21.475, -14.654, 150.792, -62.22, 127.352, -50.355, -5.15, 43.103]

12.963