These five questions belong to the same question, please solve them together, thanks

Sparrow Hotel is an upscale, 300-room hotel in Winnipeg, which strives to be recognized for extremely high customer service. For the past five years, the hotel has been using an ERP system with an automatic, express guest checkout capability. In September, the system was upgraded, and all existing employees received training on the new features on September 30. The hotel uses the number of incorrect bills as one of the service quality measures. An audit of 100 random bills is conducted every day. The audit result for the first ten days of October is shown below: Date 1 2 3 4 5 6 7 8 9 10 6 8 8 5 5 3 4 1 N 3 2 3 No. of incorrect bills (Optional spreadsheet for calculations) What type of SPC chart is best suited for the data presented above? Op-chart c-chart Ox-bar chart and R-chart Ox-bar chart only For the past two years, the average number of incorrect bills has been 2.5% of the bills audited. If three sigma control limits are used, what is the upper controllimit? 6.78% 7.18% 2.52% 9.36% Question 16 (1.5 points) Listen If three sigma control limits are used, what is the lower control limit? 0% 8.12% 1.35% 2.50% Based on the data provided for October, what can you tell about the process? The process is out of control, which means all variation in the system is random. The process is out of control, which means there is variation in the system that is not random The process is in control, which means all variation in the system is random. The process is in control, which means there is variation in the system that is not random Which of the following additional SPC charts could Sparrow Hotel use to evaluate the performance of their customer management system? Average time required for guest check-in: x-bar chart and R-chart Number of data entry errors per guest file: p-chart Average customer satisfaction score: c-chart Proportion of customers who log a complaint: c-chart