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:
[217.523, 92.701, -55.65, -89.359, 55.742, 158.634, -31.883, 206.554]

Ex Output:
69.283


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:
[168.208, 144.307, -47.446, -85.06, -45.4, -38.008]

Ex Output:

16.1