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.

[61.739, -99.854, -53.677]
-30.597

[65.727, 216.759, 101.145, 91.028]
118.665

[0.69, 48.641, -57.989, 0.381, 244.656, 41.286, 4.124]

40.256