The Tread Life of Tires Mounted on Light-Duty Trucks Follows

question 27

Multiple Choice

The tread life of tires mounted on light-duty trucks follows the normal probability distribution with a population mean of 60,000 miles and a population standard deviation of 4,000 miles. Suppose you bought a set of four tires; what is the likelihood the mean tire life of these four tires is more than 66,000 miles?

• A)0.0013
• B)0.9987
• C)0.4987
• D)0.9544

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