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:
[150.321, 169.658, 221.448, 54.785, 160.245, 9.534, 78.865, 229.753, 225.969]

Ex Output:
144.509


Ex Input:
[70.568, -80.778]

Ex Output:
-5.105


Ex Input:
[-80.516, 10.557, 143.435, -26.467]

Ex Output:

11.752