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:
[58.371, 4.131]

Ex Output:
31.251

Ex Input:
[53.271, 224.646, -66.568, -23.058, -60.09, 178.437, -70.082, 131.116]

Ex Output:
45.959

Ex Input:
[219.675, 152.31, 74.433, 218.243, 106.941, 25.977, 199.321, 119.022, 219.797, 245.448]

Ex Output:
158.117