A maintenance group aims to improve the effectiveness of its repair work. The group therefore monitors the number of maintenance requests that require a second visit to complete the repair. On any given week the maintenance group responds to 200 maintenance requests. The following table summarizes the number of those maintenance requests that required a second visit in the last five weeks. Week Number 1 2 3 4 5 Number of those maintanance requests that required a second visit 6 8 9 7 3 What type of control chart should be used here? Select one: a. mean chart b. range chart c. p-chart d. c-chart e. run test An automobile manufacturer wishes to control the number of nonconformities (defects) in a subassembly area, producing manual transmissions. The inspection unit is a single transmission and the data for 10 samples are shown below: Transmission Number 1 2 3 4 5 6 7 8 9 10 Number of Nonconformities (defects) 1 5 2 0 1 1 3 4 3 2 What type of control chart should be used here? Select one: a. mean chart b. range chart c. p-chart d. c-chart e. run test