Question: A natural gas utility is considering a contract for purchasing tires for its fleet of service trucks. The decision will be based on expected mileage.

A natural gas utility is considering a contract for purchasing tires for its fleet of service trucks. The decision will be based on expected mileage. For a sample of 100 tires tested, the mean mileage was 36,000 and the standard deviation was 2000 miles. Estimate the mean mileage that the utility should expect from these tires using a 98% confidence interval.

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