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: [-86.223, -72.035, 50.169, 168.611, -28.153, 178.994, 236.001, 108.387]

69.469