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.

[89.583, 153.453, 20.381, -17.436, -31.071, 91.041, 198.063]
72.002

[-66.735, 23.822, -34.5, 118.327, 242.333]
56.649

[-6.099, 142.31]

68.106