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:
[64.523, 131.207, -30.223, -95.659]

Ex Output:
17.462


Ex Input:
[21.723, 130.05, 75.095]

Ex Output:
75.623


Ex Input:
[-7.006, -64.467, -16.842, 47.282, 144.479]

Ex Output:

20.689


