The defect rate for your product has historically been about $3\mathrm{.}50\%.$ For a sample size of $300,$ the upper and lower $3-$sigma control chart limits$$ are:

Part $2$

UCLp $=0\mathrm{.}06540\mathrm{.}0654($enter your response as a number between $0$ and$1,$ rounded to four decimal$$ places$).$

Part $3$

LCLp $=$enter your response here $($enter your response as a number between $0$ and$1,$ rounded to four decimal$$ places$).$