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: [-6.992, -36.177, -95.203, 87.142]

Output: -12.808


Input: Consider Input: [91.408, 178.508, 77.081, 13.419, 185.372, 158.828]

Output: 117.436


Input: Consider Input: [19.301, -72.073, 13.843, -39.036, 23.681, 43.138, 172.434, -31.68]


Output: 16.201