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:
[-69.698, 181.415, -43.045, 160.857]

Ex Output:
57.382


Ex Input:
[150.321, 169.658, 221.448, 54.785, 160.245, 9.534, 78.865, 229.753, 225.969]

Ex Output:
144.509


Ex Input:
[233.625, -4.734, 47.676, -59.898, 113.808, -64.25, -51.6]

Ex Output:

30.661