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:
[227.404, 94.456, 233.241, 147.762, -31.667, -62.22, -93.912]

Ex Output:
73.581


Ex Input:
[-66.735, 23.822, -34.5, 118.327, 242.333]

Ex Output:
56.649


Ex Input:
[-67.921, 180.809, 169.443, 138.94, 107.853, -32.045]

Ex Output:

82.846