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: [17.002, 179.236, 60.396, 98.09]
Example Output: 88.681

Example Input: [-73.074, 87.743, 221.875, 126.604, 31.513, 196.863]
Example Output: 98.587

Example Input: [-8.175, 90.283, 208.815, 85.007, -82.261]
Example Output:
58.734