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: [-90.8, -48.947, 70.645, 129.195, 6.14, 114.037, 192.758, 136.033, 117.431, 28.696]

65.519