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: [-79.641, 34.518, -61.273, -33.453, -9.148, 24.155, 136.171, 13.771, -16.609, -27.983]

-1.949