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: [241.472, 42.125, -92.855, 35.853, 185.609, 228.573, -67.395, -13.144, -53.452]

56.31