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: [24.294, 103.409, -80.719, 96.027, 56.817, 18.594, 138.212, -43.989]

39.081