Determining guarantee period in normal distribution

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Reference no: EM1393340

The life corn delight popcorn maker is normally distributed with them mean of 20 months and a standard deviation of two months. The manufacturer will replace on the life popper if it breaks during the guarantee period. How long should the guarantee period be in the manufacture does no one to replace more than 3% of the poppers.

Reference no: EM1393340

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