The diameter of a motor shaft has the following specifications in millimeters: 120 ± 10. The manufacturing process used to produce these shafts is normally distributed, and control charts show it to be in control. To determine whether this process is capable, a quality control manager collected a random sample of 30 shafts and determined that the process diameter had a sample standard deviation of 2.5 millimeters. Compute the C_p and C_pk values, and determine whether this process is capable.