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:
[51.372, 141.276, 8.131, 168.539, 151.323]

Ex Output:
104.128


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

Ex Output:
-11.314


Ex Input:
[85.234, 157.251, 147.966]

Ex Output:

130.15


