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A lawn mower manufacturer wants to determine the warranty length for a new model mower whose lifetime is normally distributed with a mean of 8.7 years and a standard deviation of 1.9 years. How long should the warranty last so that no more than 3% of the mowers will have to be replaced? A. 5.5 years B. 5.9 years C. 5.7 years D. 5.3 years E. 5.1 years
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