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.
[30.232, 149.907, 184.339, 56.011, 193.276, 16.681, 193.97, 88.932, 111.693, 99.229]