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:
[230.375, -45.327, 112.137, 109.305]

Ex Output:
101.622


Ex Input:
[153.482, 150.917]

Ex Output:
152.2


Ex Input:
[88.17, -95.795, 38.421, -18.644, 31.182, -91.278]

Ex Output:

-7.991