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: [237.481, 130.133, 119.461, 14.542, 156.076, 14.023, -99.349, 71.227]

80.449