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:
[219.769, -36.26, 3.121, -22.5, 124.372]

Ex Output:
57.7


Ex Input:
[17.525, -40.156, 97.619, 39.431, -17.818]

Ex Output:

19.32