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: [-4.749, 102.787, -45.229, 184.111, 221.888, 22.727, 20.887, 34.094]

67.065