The average age of a truck in 2012 was approximately 104 yea

The average age of a truck in 2012 was approximately 10.4 years. U.S. car companies have been enjoying a surge in sales since the end of the

Suppose a national truck manufacturer randomly sampled 49 new truck buyers to determine the age of their old truck. The sample results showed a mean age of 9.9 years and a standard deviation of 2 years