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:
[14.587, 49.21, -21.274, -54.714, 243.935, 218.436]

Ex Output:
75.03


Ex Input:
[103.885, 191.867, 82.228, 177.708, 136.093, -17.022]

Ex Output:
112.46


Ex Input:
[113.433, 173.99]

Ex Output:

143.712


