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: [236.964, -16.696, 244.268, -89.543, 8.392, 238.854, 71.103, -80.021, 148.528]

84.65