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:
[51.02, -71.125, 178.19, -7.234, -99.571, -17.215]

Ex Output:
5.677


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

Ex Output:
151.195


Ex Input:
[165.227, 25.877]

Ex Output:

95.552