Suppose that the lifetimes of tires of a certain brand are

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Suppose that the lifetimes of tires of a certain brand are normally distributed with a mean of 75,000 miles and a standard deviation of σ miles. These tires come with a 60,000-mile warranty. The manufacturer of the tires can adjust σ during the production process, but the adjustment of is quite costly. The manufacturer wants to set σ once and for all so that only 1% of the tires will fail before warranty expires. Find the standard deviation to be set. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.

Reference no: EM13786272

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