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: [127.065, 246.035, 223.226, 25.124, 94.771, 208.799, -5.226, -33.367, 89.277]

108.412