The defect rate for your product has historically been about $3\mathrm{.}50\%.$ For a sample size of $200,$ the upper and lower $3-$sigma control chart limits$$ are:

Part $2$

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

Part $3$

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