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:
[-96.182, -37.177, 130.645, -44.92, -12.78, 90.335, -99.791, -11.926, 217.275]

Ex Output:
15.053


Ex Input:
[-28.295, -24.828, -66.96, -12.108, -96.597, 110.99, 172.86, -18.752, 157.717]

Ex Output:
21.559


Ex Input:
[116.459, -29.093, 209.834, -57.027, 81.94, -6.547, -26.141]

Ex Output:

41.346