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OBJECTIVES: Upon completion of this assignment you will be able to: 1. Determine failure rate and mean life from test data; 2. Find a replacement life-test sampling plan; and 3. Calculate the overall reliability of a system. RATIONAL: Increased emphasis in the eld of quality is being given to product reliability. INTRODUCTION TO QUALITY: RELIABILITYJZS POINTS] 1. Determine the failure rate for a 22hour test of nine items, where four items failed without replacement at 4, 12, 15, and 21 hours. What is the mean life for a constant failure rate? 2. Find a replacement lifetest sampling plan of 500 hours that will accept a lot with mean life of 10,000 hours 90% of the time, but will reject a lot with mean life of 2,000 hours 95% of the time. 3. Calculate the overall reliability of the system shown below to two signicant gures given the individual component reliabilities and assuming that failure of any component does not alter the reliabilities of other components: 0.80 0.90% 0.75 jL 0.75 E 0.60 I 0.80 0.60 0.90 RS = (RA)(RB). . .(RN) N components in series. RS = 1 - (1-RA)(1- RB)...(1-RN) N components in parallel