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:
[199.974, 2.205, 197.996, 172.426, 182.153, 42.045, 53.238, 18.021, 83.903]

Ex Output:
105.773


Ex Input:
[-3.281, 84.204, -74.415, 151.616, 14.048, -98.313, 95.625, -79.981]

Ex Output:

11.188


