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Mathematics 7 Online
OpenStudy (anonymous):

You measure the lifetime (in miles of driving use) of a random sample of 25 tires of a certain brand. The sample mean is 64,200 miles. Suppose that the lifetimes for tires of this brand follow a normal distribution, with unknown mean μ and standard deviation σ = 4,800 miles. A 95% confidence interval for μ is about

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