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.

[219.769, -36.26, 3.121, -22.5, 124.372]
57.7

[96.706, 239.918, 73.299, 68.184, 233.512, -76.407]
105.869

[99.188, -60.577, -70.541]

-10.643