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: [-73.046, -83.771, 1.957, 166.243, 138.615, 162.735, 26.753, 216.297, -95.073, -77.454]

38.326