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: [137.665, 130.267, 21.383, -62.647, 27.478, 7.504, -85.626, 80.306]

32.041