Definition: 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.
Input: [239.067, 241.816, -52.098, 42.072, 13.685, 151.635, -30.844, -31.95]

71.673