$3.$ According to the example of taking the defect rate and translating it into a Cp $($assuming that the specification limits are two sided and the average $=$ design nominal$),$ what is the equivalent Cp for a defect rate of $5$ units per $1000$ tested? Some of the students can try their own numbers such as $6$ defect rate per $1000$ tests etc. I would like each student to have a unique reject rate translated into Cp$,$ so I can be sure that everyone understands the Cp concept in Six Sigma and it relation to defect rates.