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:
[128.152, 95.16, 70.113, -16.853]

Ex Output:
69.143


Ex Input:
[198.636, 219.816, -72.64, 51.706]

Ex Output:

99.38