b. The sample data for a subsequent day had the values: 7.1, 11.5, 9.6, and 14.4. What conclusion can be reached about the state of the process? 1. (20 marks) A company is interested in monitoring the average time it takes to serve its customers. The results for five samples are given in the table. Sample Service time (in minutes) 10.3 7.5 1 12.1 2 10.2 13.6 8.4 10.1 12.7 11.0 9.2 3 7.8 8.1 4 10.0 6.3 8.7 9.3 7.9 5 6.6 a. Determine the central line and control limits for the range and mean charts, and discuss whether or not the process is in statistical control. 9.4 8.3