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: [157.098, -74.567, 232.772, 8.253, -37.439, -50.382, 87.844, -33.038, 124.28]

46.091