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: [79.015, 115.12, 28.584, 216.542, 5.913, -35.628, 57.618, 199.027, 23.986]

76.686