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.

[116.268, 173.27, 228.827, 52.695, 66.445, -34.051, 152.137]
107.942

[73.603, -84.154, 222.739, 205.594, 215.842]
126.725

[33.483, 62.937, 158.591, -18.635, 129.531]

73.181