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:
[-2.869, -88.698, 21.318]

Ex Output:
-23.416


Ex Input:
[231.352, -24.17]

Ex Output:
103.591


Ex Input:
[-6.326, 226.925, 127.751, -28.03, 116.327, -48.621, 88.982, -14.298]

Ex Output:

57.839