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.

[225.697, 75.029]
150.363

[-71.745, -18.239, 214.837, -22.915, 180.841, -4.641]
46.356

[-22.869, -2.429, 231.949, -84.216, -45.074, 9.195]

14.426