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:
[234.272, 196.413, -92.425]

Ex Output:
112.753


Ex Input:
[190.653, 238.208, 116.901, 237.173, 32.607, -2.198, 191.847, 91.873, 196.114]

Ex Output:

143.686