Thirty samples of size $3$ resulted in an overall mean of $15\mathrm{.}51$ minutes and average range of $1\mathrm{.}64.$ Compute control limits for x$-$ and R$-$charts. Use the control chart factors in Appendix B to answer the questions. If your answer is zero, enter $"0".$ Round your answers to three decimal places.

For the R$-$chart:

UCLR:

LCLR:

For the x$-$chart:

UCLx$$:

LCLx$$: