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.
[105.656, 162.482, 9.618, 180.797, 27.572, 157.868, 224.435]