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: [28.665, 112.251, 108.523, 90.44, 113.515, 67.927, -35.541, 58.205]

67.998