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:
[-92.167, -67.984, -31.831, -21.057, 101.792, 114.116, 185.901, -25.874]

Ex Output:
20.362


Ex Input:
[160.713, 125.985, 186.982, -94.178, 183.77]

Ex Output:
112.654


Ex Input:
[-56.131, 42.738, 69.778]

Ex Output:

18.795