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:
[146.815, 125.411, 84.472, -63.01, 79.256, -34.213, 248.004, -86.96, -39.397]

Ex Output:
51.153


Ex Input:
[224.567, -42.213, 232.017]

Ex Output:
138.124


Ex Input:
[-48.597, -49.199, 221.727, 89.162, 134.287, -66.444, -94.417, 101.402, -23.963, 170.849]

Ex Output:

43.481