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:
[227.404, 94.456, 233.241, 147.762, -31.667, -62.22, -93.912]

Ex Output:
73.581


Ex Input:
[138.602, 158.458, 241.327, 194.509, 169.45, -56.151]

Ex Output:
141.032


Ex Input:
[-51.199, -66.219]

Ex Output:

-58.709


