Normal with mean 48 months and standard deviation 9 months., Ask an Expert

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Some auto companies design emissions sensors so that they must be replaced after 1,00,000 miles. One such company found that the service life (x) in months of these sensors is approximately normal with mean 48 months and standard deviation 9 months. The company has decided to give a guarantee for the sensors for 3 years. What % age of the sensors will not satisfy the guarantee.

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