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

question 79

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 we select a sample of 40 tires and use a simulator to determine the tread life. What is the likelihood of finding that the sample mean is between 59,050 and 60,950?

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