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.
[219.752, 12.175, 155.547, -76.39, -26.954, -38.903, 67.008, -96.989, 79.572]