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:
[139.608, 17.516, 100.5, -51.362, 57.462, -77.569, -95.41, -24.339, -96.579]

Ex Output:
-3.353


Ex Input:
[-96.229, 200.453]

Ex Output:
52.112


Ex Input:
[-67.262, 24.43, 134.849, 169.866, 135.675, -0.188, 154.397, 249.332]

Ex Output:

100.137