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

Ex Output:
52.024

Ex Input:
[219.336, -29.108, -41.612, 105.709]

Ex Output:
63.581

Ex Input:
[9.477, 80.386, 229.39, 221.455, 172.89, 79.555, -7.837, 175.651, 147.418, 100.648]

Ex Output:
120.903