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: [227.906, 51.753, 136.102, 34.354, 19.172, -14.273, 181.635, 239.243, 126.67]

111.396