Calculate the mean of the following data (number of defective products produced per day): 20, 22, 29, 31, 33, 20, 22, 35, 28, 32, 25, and 27. a) Round the final answer to the nearest tenth and make sure to include the proper units. b) How did you calculate the mean (calculator, Excel, or some other method)? c) What does the mean describe (tell you) about the dataset