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: [233.239, 45.243, -83.329, 221.029, 196.435, 163.964, -17.125, 224.42, 228.382]

134.695