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:
[216.087, 41.07, 213.683, 53.822, 31.214]

Ex Output:
111.175


Ex Input:
[-57.838, -63.616, 49.646, -45.262, 73.1, -82.399, 47.168]

Ex Output:
-11.314


Ex Input:
[-7.043, -29.088]

Ex Output:

-18.066