The design specification for steel shafts to be used in an assembly with a bearing require a target value

of $0\mathrm{.}5$ inches with an upper specification limit of $0\mathrm{.}55$ inches and a lower specification limit of $0\mathrm{.}4$

inches. The control chart for the process indicates that the process is stable with a mean of $0\mathrm{.}5$ inches

and a standard deviation of $0\mathrm{.}05.$