The lifetime of a certain brand of tires is normally distributed with mean µ = 40,000 miles and standard deviation ? = 4000 miles. The company has decided to issue a warranty for the tires but does not want to replace more than 2% of the tires that it sells. At what mileage should the warranty expire? Click here to view page 1 of the table of areas under the standard normal curve. Click here to view page 2 of the table of areas under the standard normal curve. At what mileage should the warranty expire? miles
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Step 1: First, we need to find the z-score that corresponds to the 2nd percentile, which represents the point at which 2% of the tires fail. Show more…
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