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: [-71.113, -89.349, 160.103, -23.041, 36.969, 179.61, 69.819, 55.626]

39.828