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:
[66.666, -70.196, -39.152]

Ex Output:
-14.227


Ex Input:
[120.236, 116.311, -13.268]

Ex Output:
74.426


Ex Input:
[90.768, -21.39, 95.062, 199.045, 189.228, 47.509]

Ex Output:

100.037