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:
[113.021, 101.946, -14.79, -8.555, -59.095, -74.169, 80.193, 157.87, 26.321, -19.87]

Ex Output:
30.287

Ex Input:
[-84.771, 60.727, 165.566, 27.782, 159.929, 167.451, -64.15]

Ex Output:
61.791

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

Ex Output:
193.957