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: [-85.202, 41.205, 242.359, -84.8, 199.285, 56.254, 67.95, 218.03]

81.885