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:
[-60.041, -56.779, 6.2, 73.114, 137.319]

Ex Output:
19.963


Ex Input:
[-6.992, -36.177, -95.203, 87.142]

Ex Output:
-12.808


Ex Input:
[128.991, -12.032, 231.969, 181.638, 1.915, -35.762, 45.889]

Ex Output:

77.515