The defect rate for your product has historically been about $4\mathrm{.}50\%.$ For a sample size of $100,$ the upper and lower $3-$sigma control chart limits are:

$UC{L}_p=(enter$ your response $as$ a number between $0$ and $1,$ rounded $to$ four decimal places$).$

$LC{L}_p=(enter$ your response $as$ a number between $0$ and $1,$ rounded $to$ four decimal places$).$