a major television manufacturer has determined that its 19 inch color tv picture tubes 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) 5 years? (2) six years? (3) seven and one-half years?
b.) if the manufacturer offers service contracts of four years on these picture tubes, what percentage can be expected to fail from wear-out during the service period?
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