Question 9: A tire manufacturer has been concerned about the number of defective tires found recently. In order to evaluate the true magnitude of the problem, a production manager selected 10 random samples of 20 units each for inspection. The number of defective tires found in each sample are as follows Sample Number Defective Number of tires in each sample 20 20 20 20 20 20 20 20 20 20 200 2 2 4 4 6 2 0 10 Total 18 Develop a p-chart with a z-3 - CL= = (1-7 Does the P chart show that the process is under control? Yes or No and why