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.

[227.601, -61.961, 78.822, -29.52, 126.039, -44.098, 112.374, -19.23, 69.758]
51.087

[227.874, 175.626, 193.094, 63.963, 139.938]
160.099

[74.702, -97.547, -86.359, 181.882, 144.996]

43.535