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

question 10

Multiple Choice

The tread life of tires mounted on light-duty trucks follows the normal probability distribution with a mean of 60,000 miles and a 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