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: [24.808, -2.481, 165.168, 181.391, -34.315, -68.797, 20.386, 2.081, 147.561]

48.422