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Mathematics, 05.05.2020 15:58 deedee2094
A certain company makes 12-volt car batteries. After many years of product testing, the company knows that the average life of a battery is normally distributed, with a mean of 50 months and a standard deviation of 9 months. If the company does not want to make refunds for more than 10% of its batteries under the full-refund guarantee policy, for how long should the company guarantee the batteries (to the nearest month)
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A certain company makes 12-volt car batteries. After many years of product testing, the company know...
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