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: [-76.794, -53.567, 105.147, 107.691, -72.23, 154.508, -2.909, 77.452]

29.912