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.

[138.63, 106.759, 86.625]
110.671

[66.037, 30.958, 124.853]
73.949

[158.786, 36.01]

97.398