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.

[51.02, -71.125, 178.19, -7.234, -99.571, -17.215]
5.677

[-30.66, 134.777, 39.637, -41.053, 60.502, -99.875, -32.055, 51.52, 216.645, 11.994]
31.143

[36.144, 87.029, 18.025, -32.143, 69.731, -41.243]

22.924