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: [34.678, 109.562]

Output: 72.12


Input: Consider Input: [193.711, 110.309, -20.334, 151.607, 158.797, -97.825, -59.931]

Output: 62.333


Input: Consider Input: [215.296, 174.515, 137.857]


Output: 175.889