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:
[49.035, -81.115, 27.419]

Ex Output:
-1.554


Ex Input:
[-42.207, -46.667, 171.095]

Ex Output:
27.407


Ex Input:
[144.894, 100.83]

Ex Output:

122.862