A machine is available $10$ hours a day. Each part takes $60$ minutes to fabricate and $10$ minutes to setup. $10\%$ of the parts

made are defective and must go through the machine again to be reworked, during which both setup and fabrication

have to be performed again. The machine is idle for any unused time. On average, $4$ good parts are made each day. The

overall equipment effectiveness of the machine is

$($round to one decimal places$).$

A worker found that the plates had around $2\mathrm{.}4$ microns of coating applied. Manufacturing was able to correct the

problem and save these plates, but no one knew how many plates had been shipped before the problem was discovered.

The plates that were already shipped before the problem was corrected resulted in which of the following type of quality

costs?

appraisal

external failure

prevention

internal failure