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:
[196.683, 97.538, 247.799, 203.036, 203.369, -15.737]

Ex Output:
155.448


Ex Input:
[59.251, 198.593]

Ex Output:
128.922


Ex Input:
[-31.262, -3.222, 72.586]

Ex Output:

12.701