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: [7.487, 96.329, 178.464, 210.823, 121.521, 229.021, -66.53, -79.514]

87.2