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.

Ex Input:
[136.816, 121.886, 38.032, 81.322, -0.781, 112.95, 49.478, 219.21, -42.397]

Ex Output:
79.613


Ex Input:
[-66.387, 135.639, 182.921, 175.573, 105.67, -29.751, 156.67, 83.119, 19.538]

Ex Output:
84.777


Ex Input:
[-75.918, 200.289]

Ex Output:

62.185