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.

[80.113, -28.006, -40.254, 222.454, 29.784, 129.871, 141.71, -44.716, -22.74]
52.024

[138.526, 60.81, 233.845, -33.602, 189.784, 13.888, 184.543, 53.635, 18.299, -87.132]
77.26

[229.773, 89.428, 74.272]

131.158