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:
[-17.026, 165.89]

Ex Output:
74.432


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:
[105.74, -54.694, 123.17]

Ex Output:

58.072