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: [-47.323, 34.798, 11.658, 61.506, 159.654, -87.945, 89.509, 132.403, 176.143]

58.934