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: [173.593, 66.375, 5.581, 107.296, 177.574, 29.764, -9.889, 168.056, 198.412, 195.086]

111.185