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:
[178.031, -52.967, 31.914, 174.681, 155.375, -3.831, 165.333, 10.246, -14.468]

Ex Output:
71.59


Ex Input:
[74.601, 131.018, -45.91]

Ex Output:
53.236


Ex Input:
[190.624, 208.116, 244.123, 11.008, 131.095, -92.15, 109.658, 133.804, 50.323]

Ex Output:

109.622