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: [85.925, 218.341, -55.232, 136.11, 243.387, 98.158, 183.742, 85.875, 124.291, -95.213]
Example Output: 102.538

Example Input: [219.336, -29.108, -41.612, 105.709]
Example Output: 63.581

Example Input: [-64.713, 164.725, 116.739, -82.713, -93.628, 101.583, -14.634, 241.923, 156.284, 101.362]
Example Output:
62.693