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:
[-40.509, 201.39]

Ex Output:
80.44


Ex Input:
[176.928, 146.579, 134.498, 146.776]

Ex Output:
151.195


Ex Input:
[0.25, 70.678, -78.975, -44.186, -9.874, -2.717]

Ex Output:

-10.804


