Question

Rockingham Corporation makes electric shavers. The life (period during which a shaver does not need a major repair) of Model J795 of an electric shaver manufactured by this corporation has a normal distribution with a mean of 70 months and a standard deviation of 8 months. The company is to determine the warranty period for this shaver. Any shaver that needs a major repair during this warranty period will be replaced free by the company.
a. What should the warranty period be if the company does not want to replace more than 1% of the shavers?
b. What should the warranty period be if the company does not want to replace more than 5% of the shavers?


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  • CreatedAugust 25, 2015
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