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: [233.232, -98.555, 86.99, 130.061, 242.125, 224.964, -4.266, 52.033, 155.198]

113.531