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: [-53.962, 160.406, 187.622, 70.818, -27.967, -67.85, 11.942, -57.093]

27.99