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:
[1.222, 33.339, 163.969]

Ex Output:
66.177


Ex Input:
[243.697, 165.796, 114.518, 207.298, 191.227]

Ex Output:
184.507


Ex Input:
[34.035, -52.533, 154.197, 53.232, 156.407]

Ex Output:

69.068