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:
[62.65, 155.504, 55.659, 77.757]

Ex Output:
87.892


Ex Input:
[80.346, 228.37, 18.978, -42.02]

Ex Output:
71.419


Ex Input:
[231.639, -87.0, 145.362]

Ex Output:

96.667