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:
[-42.207, -46.667, 171.095]

Ex Output:
27.407


Ex Input:
[214.036, 24.752, 106.748, 206.9, 42.432, 233.646]

Ex Output:
138.086


Ex Input:
[55.273, 205.068, 135.791, -49.691]

Ex Output:

86.61