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A major television manufacturer has determined that its 40-inch LED televisions have a mean service life that can be modeled by a normal distribution with a mean of six years and a standard deviation of one-half year.

a. What probability can you assign to service lives of at least (1) Five years? (2) Six years? (3) Seven and one-half years?

b If the manufactuerer offers service contracts of four years on these televisions what percentage can be expected to fail from wear-out during the service period?

c. What service life the manufacturer must specify, so that at least .9772 of the products would not be in need of warranty service?

Operation Management, Management Studies

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