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: [151.271, -42.466, 75.918, -71.371, 206.428, 33.811, -80.568, -33.431]

29.949