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:
[199.153, 182.13, -7.832, -60.259]

Ex Output:
78.298


Ex Input:
[-93.372, 58.665, 230.024, 208.635]

Ex Output:
100.988


Ex Input:
[-51.918, 100.084, -74.934, -95.889]

Ex Output:

-30.664


