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:
[-66.271, 56.586, -21.072, 136.915, 54.951, 112.054]

Ex Output:
45.527


Ex Input:
[-2.869, -88.698, 21.318]

Ex Output:
-23.416


Ex Input:
[75.315, -9.711, -65.963]

Ex Output:

-0.12