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:
[21.659, 63.646, -97.361]

Ex Output:
-4.019


Ex Input:
[235.595, 227.906, -52.328, 100.922, 124.177, 149.582, -41.738]

Ex Output:
106.302


Ex Input:
[-77.226, 44.49]

Ex Output:

-16.368