$4-1)$ Reboard Electronics, Inc. is a reprocessor of electronic boards used in computers. The quality

manager is trying to determine the non$-$conformances per unit $($NPU$)$ and the throughput yield. The

quality manager has requested that $500$ boards be inspected and $25$ non$-$conformances were found.

a$.$ Calculate the nonconformances per unit $($NPU$)$ and the throughput yield $($TY$).$

b$.$ If the production process consists of four steps, with step $1$ having a throughput yield of $98$

percent; step $2,99$ percent; step $3,96$ percent; and step $4,97$ percent, what is the rolled

throughput yield $($RTY$),$ and the proportion nonconforming?

$4-2)$ Over the last year $752$ drug doses were administered at the Goodhealth clinic. Quality is measured

by the proper dosage as well as the correct drug. In two instances, the incorrect size of pill was given,

and in one case, the wrong drug was given. At what sigma level is Goodhealth's process?