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: [229.418, 94.324, 39.092, 211.928, 220.865, 108.323, 239.486, 18.68, 102.042]

140.462