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:
[-6.099, 142.31]

Ex Output:
68.106


Ex Input:
[-18.796, 194.818]

Ex Output:
88.011


Ex Input:
[-71.951, -1.97, 148.323, 151.675, 32.313, 178.55, -82.134, 170.977, 130.153]

Ex Output:

72.882