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

question 43

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 between 57,000 and 63,000 miles?

• A)0.4332
• B)0.8664
• C)1.00
• D)Very likely

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