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:
[99.278, 72.353, -21.292]

Ex Output:
50.113


Ex Input:
[37.853, 78.283, 143.128, 82.561, 181.661, -89.154, 50.037]

Ex Output:
69.196


Ex Input:
[50.364, 55.624]

Ex Output:

52.994