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: [-64.512, 228.31, 208.19, 142.367, 58.623, 181.565, -72.181, 132.976]

101.917