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:
[-57.334, 24.995, 72.22, -78.376, 218.297, 203.999, 21.93, -20.246, 15.97]

Ex Output:
44.606


Ex Input:
[112.141, 221.013, 75.929, -19.73, 151.257]

Ex Output:
108.122


Ex Input:
[9.127, 71.679, 111.522, 144.874, -72.827]

Ex Output:

52.875