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:
[1.222, 33.339, 163.969]

Ex Output:
66.177


Ex Input:
[-8.87, 232.908, 141.714, -47.559, 161.192, 203.441]

Ex Output:
113.804


Ex Input:
[-63.697, 61.614, -59.842, -45.363]

Ex Output:

-26.822