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:
[54.715, 180.963, 239.308, 175.084, 147.044, 136.262, 184.009]

Ex Output:
159.626


Ex Input:
[-57.838, -63.616, 49.646, -45.262, 73.1, -82.399, 47.168]

Ex Output:
-11.314


Ex Input:
[-32.557, -70.922, 191.786, 244.222]

Ex Output:

83.132