Definition: 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.
Input: [-18.001, 51.172, -66.333, -79.852, 93.818, 230.012, 55.556, -63.057, 124.868]

36.465