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:
[231.159, 217.795, 230.676, -11.951, -82.697, 31.413]

Ex Output:
102.732


Ex Input:
[112.53, -67.079, 177.313, 230.482, 57.316, -37.564]

Ex Output:
78.833


Ex Input:
[-84.522, -84.904, 107.97, 176.476, 221.07, 52.302, 223.497, 64.707, 111.483]

Ex Output:

87.564