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: [65.591, -56.104, -28.389, -22.521]

Output: -10.356


Input: Consider Input: [57.506, 172.357, 191.473, 131.849]

Output: 138.296


Input: Consider Input: [245.397, 57.152, -69.451, 127.248, 30.426, 221.018]


Output: 101.965