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: [227.27, 189.522, 101.897, 38.192, 119.101, 211.617, 111.434, 32.085, -71.2]

106.658