If only a lower or upper specification limit is available, Minitab does not compute Cp.
Cp does not take into account the mean or the target value. In this sense, Cp represents the theoretical “best” value and may be thought of as the potential capability of the process at the current level of technology.
Because the spread of the process is slightly larger than the allowable tolerance (±0.1), the Cp value of 0.98 is less than 1. Therefore, the process is not capable even under the best conditions.