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: [0.859, 248.896, -40.131, -80.511, 173.606, 48.645, 11.93, 124.678, 95.747]

64.858