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need 10000% perfect answer Cook-it deep fryer has a mean time before failure of 32 months with a standard deviation of 6 months, and the

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Cook-it deep fryer has a mean time before failure of 32 months with a standard deviation of 6 months, and the failure times are normally distributed. What should be the warranty period, in months, so that the manufacturer will not have more than 9 % of the deep fryers returned? Round your answer down to the nearest whole number

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