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:
[89.583, 153.453, 20.381, -17.436, -31.071, 91.041, 198.063]

Ex Output:
72.002


Ex Input:
[223.951, 2.518, 140.336, -38.799, 217.497, 212.153, 21.874]

Ex Output:
111.361


Ex Input:
[217.816, 85.707, 225.363, -73.901, 24.037]

Ex Output:

95.804