PLEASE SHOW WORK AND LABEL EACH PARTS ANSWER Problem $3.$ A maintenance group improves the effectiveness of its repair work by monitoring the number of maintenance requests that require a second call to complete the repair. Twenty weeks of data are shown in Table below. $($a$)$ Find trial control limits for this process. $($b$)$ Design a control chart for controlling future production. $($c$)$ Analyze the data using an average sample size