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: [129.453, 232.284, -34.595]

Output: 109.047


Input: Consider Input: [203.976, 106.117, 62.128, -89.428, 180.453, 155.566, 213.868]

Output: 118.954


Input: Consider Input: [-74.514, -54.334, 67.06, 47.348, 31.568]


Output: 3.426