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: [81.09, 67.064, 134.568, 153.026, 93.382, -28.117, 27.819, -24.987]

62.981