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:
[74.43, 138.738, 114.237, 138.845, 188.957, 103.103, -43.988, -68.085, 157.274]

Ex Output:
89.279


Ex Input:
[-9.301, -10.629, 88.777, 68.965]

Ex Output:
34.453


Ex Input:
[137.282, 188.791, 8.079, -83.468, -73.296]

Ex Output:

35.478