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: [20.191, -54.91, 19.381, -4.587, -31.613, -11.765, 198.59, 101.529]

29.602