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.
[85.234, 175.382, -32.958, 63.008, 68.871, 237.523, -32.28, 191.82]