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: [-48.597, -49.199, 221.727, 89.162, 134.287, -66.444, -94.417, 101.402, -23.963, 170.849]

43.481