A high-paced discount store in Los Angeles has noticed that checking errors have increased recently. They plan to use control charts with three standard deviation control limits to monitor the process. From previous sampling, they believe that the average number of errors is 5%. They decided to take a sample of 100 transactions over 10 days. The number of transactions in error for each day was 5, 7,6, 5, 6,4,6 3, 10, 8.

a. What is the center line for the p chart?
b. What is the upper control limit for a p chart?
c. What is happening to the process?