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:
[245.466, 19.262, 199.878]

Ex Output:
154.869


Ex Input:
[216.087, 41.07, 213.683, 53.822, 31.214]

Ex Output:
111.175


Ex Input:
[-35.205, 236.859]

Ex Output:

100.827