A vitamin manufacturer molds its own plastic containers and prints?

A vitamin manufacturer molds its own plastic containers and prints the labeling directly onto the container. The printing process is run in batches of 500. Sometimes the printing smears on a container, making it unsellable. The table below lists the number of unusable containers from the previous 15 batches. Construct a control chart for the fraction defective using two-sigma limits. Is the process in control? If not, eliminate any values that are outside the limits and compute revised limits. Number of unusable containers 1 2 3 2 3 4 3 9 Batch Number 5 678 2 9 10 11 12 13 14 15 1 23 1 4 1 0 3 2 3 UCL = LCL = UCL = LCL = (if needed)