2. An automatic filling machine is used to fill 2 -litres bottles of cola. The machine's output is known to be approximately Normal with a mean of 2.0 litres and a standard deviation of 018 litres. Output is monitored using means of samples of seven observations. a. Determine the upper and lower control limits that will include roughly 95.44 percent of the sample means. (Round the final answers to 3 decimal places.) b. If the means for 6 samples are 1.990,1.994,1.993,2.008,2.004, and 1.992 , is the process in control? 3. A friend of yours has told you that no matter how much she studies, she does badly in exams. Help her set up a cause-and-effect diagram for her