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: [91.408, 178.508, 77.081, 13.419, 185.372, 158.828]
Example Output: 117.436

Example Input: [103.663, -40.655, 59.867, -7.683, -63.184, -39.383, 134.187, 87.706]
Example Output:
29.315