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: [-48.196, 15.566, 65.782, 174.566, -91.786, 52.379, 2.658, 76.856]

30.978