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:
[22.306, 72.768, 218.947, 52.973, 100.121, 157.59, -92.109]

Ex Output:
76.085


Ex Input:
[248.385, -40.468, -97.132]

Ex Output:
36.928


Ex Input:
[117.697, 175.951, 200.379, 164.197, 231.534, 233.314, 175.515]

Ex Output:

185.512