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: [93.989, 98.225, -28.896, 140.887, 46.331, 17.396, 174.394, 40.637]

72.87