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: [163.252, 141.323, 146.698, 237.696, -32.5, 190.611, -32.68, 94.197, 29.408]

104.223