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:
[47.595, -7.171, 4.333, 160.025, 152.275, 90.23, 128.643, 145.181]

Ex Output:
90.139


Ex Input:
[73.603, -84.154, 222.739, 205.594, 215.842]

Ex Output:
126.725


Ex Input:
[211.229, 29.427, 35.939, -45.643]

Ex Output:

57.738