analyst is checking the process capability associated witl ecifically the amount of torque used to tighten a fastener.

Twenty$-$five samples of size $4$ have been taken. These were used to create X$-$Bar and R charts. The values for these charts are as follows:

The upper and lower control limits for the X$-$Bar char $72\mathrm{.}37Nm,$ respectively.

$x-$Double Bar is $73\mathrm{.}58Nm.$ R$-$Bar is $1\mathrm{.}66.$ The specification limits are $80Nm+-10.$

Co$,$ Cp$,$ and Cpk$.$ Interpret the values. $(30$ pts$.)$