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: [-60.388, 179.882, -60.874, 161.351, -1.738, 65.73, 2.086, -71.823]

26.778