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:
[220.903, 155.959]

Ex Output:
188.431


Ex Input:
[38.24, 196.576, -84.173, -45.001, 1.607, 170.177, 234.811, -60.183, -91.513]

Ex Output:
40.06


Ex Input:
[-14.506, 165.485, 217.937, 16.563, -50.907]

Ex Output:

66.914