Posted by **Jacob** on Sunday, June 20, 2010 at 11:15am.

. 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 45 months and a standard deviation of 7 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)? my answer was 36m is this correct

58 months

53 months

36 months

45 months

49 months

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