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: [68.799, 211.687, 209.496, 216.91, -85.425, 40.557, -40.235, 146.223, 113.474]

97.943