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: [100.422, 199.731, 138.971, 95.515, 9.517]

Output: 108.831


Input: Consider Input: [231.352, -24.17]

Output: 103.591


Input: Consider Input: [88.456, 191.052]


Output: 139.754