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:
[176.928, 146.579, 134.498, 146.776]

Ex Output:
151.195


Ex Input:
[-71.745, -18.239, 214.837, -22.915, 180.841, -4.641]

Ex Output:
46.356


Ex Input:
[15.636, 19.433]

Ex Output:

17.534


