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: [38.382, -13.844, 187.259, 143.714, -34.901, 23.234, 192.579, 52.272, 72.299]

73.444