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: [-22.313, 92.492, 71.429, 8.979, 199.21, 140.229, 101.187, 35.847, 163.828, 17.24]

80.813