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:
[223.847, 115.483, 148.407, -44.824, 99.251, 36.833, -45.949]

Ex Output:
76.15


Ex Input:
[87.258, 29.558, -48.199, -28.615, 46.642]

Ex Output:

17.329