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

Ex Output:
21.559


Ex Input:
[41.212, 221.072, 226.666, 3.688, 180.239, 142.767, 184.012, 63.249]

Ex Output:
132.863


Ex Input:
[21.65, 127.948, 174.722, -15.143, 223.442, 210.744, 222.348, 43.325]

Ex Output:

126.13