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: [43.591, 198.718, 11.835, 59.339, 114.192, 121.295, 129.154, 125.966, 23.06]

91.906