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QUESTION
The occurrence of the first breakdown of an automatic washing machine is normally distributed with a mean of 6.1 years and a standard deviation of...
The occurrence of the first breakdown of an automatic washing machine is normally distributed with a mean of 6.1 years and a standard deviation of 1.6 years. How long (full years) should these washing machines be guaranteed so that no more than 10 % would require repairs during the warrantee period?
