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.

[-81.785, -44.121]
-62.953

[45.112, 147.024, -15.583, 33.655, -60.031]
30.035

[116.014, 21.648]

68.831