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: [-45.613, -3.911, 216.85, -40.965, 54.086, -17.634, 199.144, 79.58]

55.192