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The Director of Vehicle Maintenance for a large mass transportation authority wants to know the average...

The Director of Vehicle Maintenance for a large mass transportation authority wants to know the average life of bus tires for the fleet of 1,800 busses. A random sample of 100 tires is studied and the mean life is 20,000 miles with a standard deviation of 1,200 miles. Construct a 95% confidence interval for the true life of tires.

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