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: [120.236, 116.311, -13.268]

Output: 74.426


Input: Consider Input: [238.315, 168.986, -67.694]

Output: 113.202


Input: Consider Input: [-57.641, 107.594, -29.644, 121.839, -3.844]


Output: 27.661