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:
[228.031, -85.617, 36.164]

Ex Output:
59.526


Ex Input:
[3.556, 65.177]

Ex Output:
34.366


Ex Input:
[-17.95, 16.889]

Ex Output:

-0.53


