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: [-99.726, 122.305, 8.195, 71.552, 170.802, 16.32, 196.91, 160.34, -17.713, -96.508]

53.248