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: [-94.068, -52.758, 53.31, -5.178, -20.667, 100.51, 100.973, 168.318, 54.245, 210.951]
Example Output: 51.564

Example Input: [15.491, 60.283, 240.958, 155.995, 35.585, -55.875, 82.379, 142.503, 95.176, 85.281]
Example Output: 85.778

Example Input: [93.018, 193.55, -63.786, -20.865, -24.826, 168.569, -36.063, 202.202, 111.759, 33.249]
Example Output:
65.681

