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.

[128.328, 20.497, 96.178, 237.663, 80.568, 109.722]
112.159

[211.927, 190.941, -74.44, 7.991, -80.894, 48.291, 127.383, -51.774]
47.428

[-23.309, -38.568]

-30.938