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: [50.45, 54.627, 114.736, -12.781, 143.789, 18.589, -67.676, -30.697, 25.542]

32.953