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:
[245.466, 19.262, 199.878]

Ex Output:
154.869


Ex Input:
[108.822, 139.139, 130.938, 100.996, 155.361, 8.752, 221.639, -12.877]

Ex Output:
106.596


Ex Input:
[-78.496, -66.346, 71.71]

Ex Output:

-24.377