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

[223.847, 115.483, 148.407, -44.824, 99.251, 36.833, -45.949]
76.15

[70.784, -84.85, 98.171, 130.82, 117.264]

66.438