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: [93.433, 148.366, 19.269]
Example Output: 87.023

Example Input: [41.081, 166.314, -14.556, -84.648, -8.286]
Example Output: 19.981

Example Input: [-4.527, 190.006, 207.554, 178.685, -20.05, 13.024, 190.617, 37.539]
Example Output:
99.106