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: [80.477, 243.204, -63.196, -43.064, 114.61, 74.079, -71.568]

47.792