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: [-79.748, 98.398, 55.667, 77.39, -20.719, 187.168, 142.334, 110.723]

71.402