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: [-86.31, 154.085, -73.682, 247.059, 81.38, -75.433, -33.222, 186.855]

50.092