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: [173.696, 61.348, 1.068, 139.875, -11.885, 214.671, 180.011, 82.018, 111.482]

105.809