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: [171.439, 0.981, 42.253, 239.995, 129.938, -67.125, -69.565, -53.374, -51.357]

Output: 38.132


Input: Consider Input: [113.544, 39.961]


Output: 76.752