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: [96.921, 188.823, 195.627, -32.429, 144.606, -13.635, -44.458, 48.391, -19.867, 162.804]

72.678