RE: PMHUB-G FTY RTY problem - are you up to it?

This is a Six Sigma question where FTY = First Time Yield and RTY = Rolled Throughput Yield 

 

A good explanation of these terms and how to calculate and use them can be found here….. http://www.qualitydigest.com/mar00/html/sixsigma.html

 

BR,
Dr. PDG, Jakarta

http://www.build-project-management-competency.com

 

 

From: pmhub@googlegroups.com [mailto:pmhub@googlegroups.com] On Behalf Of PMHUB
Sent: Wednesday, May 18, 2011 04:29
To: pmhub@yahoogroups.com; PMHUB
Subject: PMHUB-G FTY RTY problem - are you up to it?

 

A project manager needs a certain number of identical valve housings for a power station project. He starts with 100 raw items which are made as metal castings. Out of this batch, 15 are found leaking from micro-porosities in a subsequent pressure test. 6 of these housings can be recovered by a special sealing process for raw castings. 
The 91 housings are then being machined. After this process step 10 machined castings are found leaking. 3 of these items can also be saved using another sealing process for machined castings. 
The remaining 84 housings are getting mounted to the power plant pipework. During a pressure test after this process step it is found that 12 valves are leaking. Out of these a number of 6 valves can be saved by replacing the sealing rings used. 
Finally the project manager has 78 valves which he can use. What is true? 

Options : 
FTY = 0.91, RTY = 0.84 
FTY = 0.65, RTY = 0.78 
FTY = 0.84, RTY = 0.91 
FTY = 0.78, RTY = 0.65 

(source Lehman 75 problems)

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