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: [-76.87, 149.531, -83.778, 11.617, 77.111, 42.523, -24.143, 123.225]

27.402