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: [-86.657, 29.121, 121.634, -87.296, 115.09, 57.714, -30.534, 201.717, -93.628, -0.801]

22.636