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:
[15.491, 60.283, 240.958, 155.995, 35.585, -55.875, 82.379, 142.503, 95.176, 85.281]

Ex Output:
85.778


Ex Input:
[138.63, 106.759, 86.625]

Ex Output:
110.671


Ex Input:
[219.791, 112.864, 175.918, -70.533, -89.211, 40.58, 124.448]

Ex Output:

73.408