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:
[-63.278, 115.92, 179.699, 73.157]

Ex Output:
76.374


Ex Input:
[82.439, -85.167, 100.665, -83.297]

Ex Output:
3.66


Ex Input:
[238.269, 89.154, 228.831, 110.529]

Ex Output:

166.696