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.

[-94.286, 148.737, 234.8, 148.972]
109.556

[54.715, 180.963, 239.308, 175.084, 147.044, 136.262, 184.009]
159.626

[88.724, 12.098, -74.935, 60.97, 159.794, 49.669, 84.371, 172.309, 190.247]

82.583