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:
[-19.769, 147.929, -36.133, 201.287, 28.528, -6.089, 122.533, 127.892, -36.662]

Ex Output:
58.835


Ex Input:
[54.908, 25.798]

Ex Output:
40.353


Ex Input:
[40.781, 76.611, 89.978, -90.541]

Ex Output:

29.207