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: [4.435, 100.482, 125.267, -76.982, 9.994, 192.069, 54.099, -40.749]
Example Output: 46.077

Example Input: [93.34, 211.631, 173.556, -91.68, 236.096]
Example Output: 124.589

Example Input: [143.08, -95.41, 80.605, 177.631, 10.024, -83.45, 107.148, 47.507, 115.672, 100.06]
Example Output:
60.287