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.

[-64.444, 127.032, 230.129, 118.938, 74.084, 147.077, -79.149, -99.452, 22.993]
53.023