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:
[-67.542, 65.934, 223.305, 25.694, 159.037]

Ex Output:
81.286


Ex Input:
[-68.429, 130.101, 45.673]

Ex Output:
35.782


Ex Input:
[153.399, 61.269, -88.044, -90.479, -13.236, -24.819]

Ex Output:

-0.318