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:
[227.404, 94.456, 233.241, 147.762, -31.667, -62.22, -93.912]

Ex Output:
73.581


Ex Input:
[175.015, 7.294, -30.146, 197.862, 76.557, 16.567, 176.301]

Ex Output:
88.493


Ex Input:
[72.78, -56.673, -49.957, -84.089]

Ex Output:

-29.485