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.

[14.818, 98.871, -79.033]
11.552

[127.703, -82.203, 53.438]
32.979

[56.5, 190.676, 67.867, 30.479]

86.38