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: [-98.078, 1.658, 117.219, -29.015, 204.611, 140.073, 4.792, -10.659]

41.325