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.
[51.209, 99.06, 127.443, 206.331, -7.072, 177.117, -15.635, 176.81]