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: [-23.056, 24.547, 162.936, -98.987, 215.764, 244.802, 66.802, -3.494, 125.067]

79.376