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:
[54.715, 180.963, 239.308, 175.084, 147.044, 136.262, 184.009]

Ex Output:
159.626


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

Ex Output:
56.649


Ex Input:
[32.458, 21.603, 243.923, 13.381, 148.655, -38.201, 231.847, 71.906, -5.428, -68.618]

Ex Output:

65.153