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:
[84.13, 59.186, 115.606]

Ex Output:
86.307


Ex Input:
[14.166, 216.734, -23.073, 209.811, 203.336, 91.659, 142.602, 1.151, -39.869, -54.838]

Ex Output:
76.168


Ex Input:
[49.035, -81.115, 27.419]

Ex Output:

-1.554