3. The screws used in aircraft construction are slightly gathered so that they remain secure and will not loosen under vibration. Assume that 95% of all bolts pass a final inspection. Of the 5% that fail, 20% of them are so defective that they are discarded. Those that are left are sent to a gathering operation and 20% must be discarded. 60% remainder is corrected with the gathering process and then pass inspection.

 a) What is the probability that a randomly selected bolt will pass inspection, either at the start or after puckering again? 

 b) If a screw passed the inspection, what is the probability that it passed the initial inspection and didn't need to scowl again?

Answer rating: 100% (QA)

Given 95 bolts pass a final inspection 5 bolts Fail in final inspection In 5 20 are scrapped 8... View the full answer