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.
Q: [-87.469, -11.619, 167.352, -20.709, -24.738, 120.883, 49.157, 155.368]
A: 
43.528