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:
[215.854, -43.532, 51.416]

Ex Output:
74.579


Ex Input:
[172.084, 126.948, 90.757]

Ex Output:
129.93


Ex Input:
[-39.897, -17.803]

Ex Output:

-28.85