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.
[176.185, 217.985, 215.867, 148.644, -3.379, -30.478, 52.771, -75.198]