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: [44.669, 246.342, -0.223, 10.643, 42.112, 92.598, -80.159, 59.387, -61.294]

39.342