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.

Example Input: [127.522, 232.86, 46.593]
Example Output: 135.658

Example Input: [161.683, 162.041, 187.429, -79.681, 60.809, 225.806]
Example Output: 119.681

Example Input: [119.367, 50.478, -88.768, 245.971, 108.363, 162.516, 207.332, 51.384]
Example Output:
107.08