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:
[112.141, 221.013, 75.929, -19.73, 151.257]

Ex Output:
108.122


Ex Input:
[60.02, -66.628, -95.571, 114.26, 109.577, 141.08, 154.303, 228.454, 46.856, 7.365]

Ex Output:
69.972


Ex Input:
[-77.317, 173.278, 137.614, -26.344]

Ex Output:

51.808