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:
[-68.429, 130.101, 45.673]

Ex Output:
35.782


Ex Input:
[128.152, 95.16, 70.113, -16.853]

Ex Output:
69.143


Ex Input:
[186.232, 96.42]

Ex Output:

141.326