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:
[138.63, 106.759, 86.625]

Ex Output:
110.671


Ex Input:
[213.2, 159.287, 214.859, 189.464, 185.706, -85.847, 215.647, 8.545]

Ex Output:
137.608


Ex Input:
[166.004, -89.509]

Ex Output:

38.247