To test the thickness of automobile tires and light truck tires, it is recommended to use a transducer with a frequency of 2.25 MHz. A company is manufacturing transducers with a specification limit between 2.00 MHz and 2.25 MHz for this usage. After recording the frequency of 50 transducers, they find that their process is stable but incapable due to its broad distribution, so the Cpk (0.411) and Ppk (0.394) values are low.