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:
[100.422, 199.731, 138.971, 95.515, 9.517]

Ex Output:
108.831


Ex Input:
[185.594, 89.215, 19.941, 23.299, 47.251]

Ex Output:
73.06


Ex Input:
[-73.228, 3.718]

Ex Output:

-34.755