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:
[157.631, 106.369, -25.319, 160.78, -87.597, 222.819, -60.99, 36.758, -3.695]

Ex Output:
56.306


Ex Input:
[100.422, 199.731, 138.971, 95.515, 9.517]

Ex Output:
108.831


Ex Input:
[230.178, 86.499]

Ex Output:

158.338