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:
[125.987, 140.164, 103.07, -78.923, -92.734, -96.888]

Ex Output:
16.779


Ex Input:
[227.601, -61.961, 78.822, -29.52, 126.039, -44.098, 112.374, -19.23, 69.758]

Ex Output:
51.087


Ex Input:
[-91.375, 30.921, 74.541, 100.791]

Ex Output:

28.719