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.

[65.591, -56.104, -28.389, -22.521]
-10.356

[218.807, 72.849, 7.838, 124.81, 45.929, 239.888]
118.354

[32.761, -85.094, -14.165, 82.742, -62.362, -62.383, -77.496, 139.749, -21.633]

-7.542