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: [-84.94, 142.21, 234.406, 22.533, -56.631, 209.944, -25.071, 152.08]

74.316