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:
[237.501, 67.08, 13.857]

Ex Output:
106.146


Ex Input:
[227.404, 94.456, 233.241, 147.762, -31.667, -62.22, -93.912]

Ex Output:
73.581


Ex Input:
[105.239, 215.988, 207.513, 161.111, 214.529, 232.214, 129.468, 240.417]

Ex Output:

188.31