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: [-98.71, 60.583, 13.907, 232.317, -34.461, 71.265, 35.162, 23.503]

37.946