The problem from the textbook online tutorial $($T$2)-$ T$2\mathrm{.}5$

Kristi Conlin$$s firm in Waco, Texas, has designed an OC curve that shows a $23$ chance of accepting lots with a true percentage defective of $2\%.$ Lots of $1,000$ units are produced at a time, with $100$ of each lot sampled randomly. What is the average outgoing quality level?

A bank follows an acceptance sampling plan, wherein a lot of $4000$ credit accounts, and a sample of $20$ accounts are examined. If more than one defective account is found, the whole lot will be subjected to $100$ percent inspection.

Construct the OC curve for this sampling plan.

Construct the AOQ curve for this plan using formula $10$S$-9($page $13$ of reading $2,$ Stevenson text$),$ assuming defectives found during $100$ percent inspection are replaced with good parts. What is the approximate AOQL?