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:
[112.141, 221.013, 75.929, -19.73, 151.257]

Ex Output:
108.122

Ex Input:
[79.04, 110.342, 208.846, 132.702, 48.832, -81.929]

Ex Output:
82.972

Ex Input:
[120.623, 69.374, 47.751, 121.126, -98.66, -52.379, 172.802, -65.776, 164.938, -35.405]

Ex Output:
44.439