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.

[-38.715, 205.647, 66.034, 49.8, -92.051, 111.017, 149.689]
64.489

[125.67, 5.514, 161.93, 107.05, 118.949, 233.815, 230.211]
140.448

[155.26, -63.836, -27.201]

21.408