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:
[93.405, -31.061]

Ex Output:
31.172


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:
[-87.973, 63.926, -52.186, -62.799, 112.047, 87.475, -45.29, 164.877, 197.484]

Ex Output:

41.951