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: Consider Input: [80.346, 228.37, 18.978, -42.02]

Output: 71.419


Input: Consider Input: [211.927, 190.941, -74.44, 7.991, -80.894, 48.291, 127.383, -51.774]

Output: 47.428


Input: Consider Input: [12.362, 69.938, -46.662, -71.788]


Output: -9.038


