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: [96.05, -41.158, 143.014, 131.648, 173.96, -17.481, 22.924, 81.858, -2.375]

65.382