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:
[218.46, 7.937, 155.624, 82.813, 93.516]

Ex Output:
111.67


Ex Input:
[1.222, 33.339, 163.969]

Ex Output:
66.177


Ex Input:
[28.283, -38.113]

Ex Output:

-4.915