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.

[169.421, 88.16]
128.791

[214.656, -82.183, 105.038, -34.9, -44.836, 143.236, 183.045, 160.483, 34.398]
75.437

[-31.071, 221.836, 43.298, 169.798]

100.965