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: [-71.939, -11.035, 40.708, 197.891, 138.006, 164.289, 28.858, 127.368]

76.768