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:
[169.421, 88.16]

Ex Output:
128.791


Ex Input:
[169.131, -79.809, 119.898, 174.146, -1.167, 89.734, 155.318, -26.905, 182.476, 164.085]

Ex Output:
94.691


Ex Input:
[91.118, 17.484, 235.926, 125.736, 18.112, 221.52, 55.133, 234.247, 50.777, -4.905]

Ex Output:

104.515