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: [43.554, 122.733, 40.669, 163.641]
Example Output: 92.649

Example Input: [-27.722, -35.758, 83.995, -7.374, 60.825, 165.182]
Example Output: 39.858

Example Input: [-86.31, 154.085, -73.682, 247.059, 81.38, -75.433, -33.222, 186.855]
Example Output:
50.092