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:
[88.77, 109.102, -86.446, 207.301, 160.91, -12.956]

Ex Output:
77.78


Ex Input:
[185.594, 89.215, 19.941, 23.299, 47.251]

Ex Output:
73.06


Ex Input:
[9.202, -54.035, -18.11]

Ex Output:

-20.981