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.

Ex Input:
[74.43, 138.738, 114.237, 138.845, 188.957, 103.103, -43.988, -68.085, 157.274]

Ex Output:
89.279

Ex Input:
[192.335, 189.22, 235.216, 130.727, 222.285]

Ex Output:
193.957

Ex Input:
[-52.02, 100.638, -20.981, 195.412, -57.479, -8.839, 82.687, 230.54, 113.853]

Ex Output:
64.868