5. A mobile device manufacturer has a quality process in place where the quality team always uses a sample size of 100 disk drives and have recorded the past 25 samples. This record indicates that there are a total of 68 non-conforming disk drives. The system is believed to have been under normal operating conditions.

a. Construct an appropriate control chart with control limits such that 97 percent of the disk drives under the normal process conditions would fall within the control limits.

b. Suppose we find the number of non-conforming disk drives over the next five samplings were: 10, 20, 5, 10, and 14. What can you tell about the process now? Why?