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:
[125.332, 80.443]

Ex Output:
102.887


Ex Input:
[-51.496, 56.177, 55.554, -17.425, -6.185, 3.721]

Ex Output:

6.724