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

Ex Output:
51.087


Ex Input:
[-44.977, 79.906, -20.036]

Ex Output:
4.964


Ex Input:
[144.791, 40.782, 56.067, -74.893, 206.791]

Ex Output:

74.708