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.

[192.529, -67.249, 123.707, 41.987, 11.587, 202.189, 12.989]
73.963