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.
[133.415, 67.065, 27.652, 40.378, -10.416, 232.527, 240.997, 188.159]