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:
[91.408, 178.508, 77.081, 13.419, 185.372, 158.828]

Ex Output:
117.436


Ex Input:
[-24.069, 49.942, -56.199, 147.337, 81.429, 198.62, -91.886, 33.842, -16.712, -51.661]

Ex Output:
27.064


Ex Input:
[51.66, 58.159, 168.666, -70.01, 204.748, 234.693, 137.51, 247.334, 189.8]

Ex Output:

135.84