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: [54.209, 124.549, 29.894, 158.752, -29.732, -82.407, 95.733, -42.14]

38.607