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.
[216.358, 5.593, 127.534, 244.441, 124.313, 162.482, 104.253, 69.739, -72.636]