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: [40.891, 9.99, 144.96, 56.832, 10.417, 22.589, -14.631, -14.59]

32.057