S
Stacie W
Guest
A tire company did a sampling distribution on its truck tires and determined that the tires have a mean life of 40,000 miles with a standard deviation of 4,620 miles (3 pts. each).
a. What is the probability that the life of a single tire will be less than 39,200 miles?
b. What is the probability that the mean life of a sample of 100 tires will be less than 39,200 miles?
c. The company wants to give a reasonable warranty on this tire, yet protect itself so that they won't have to replace more than 7% of the tires. What guarantee (in miles) should the company state in its advertisement for the tires? Assume that the data is normally distributed.
a. What is the probability that the life of a single tire will be less than 39,200 miles?
b. What is the probability that the mean life of a sample of 100 tires will be less than 39,200 miles?
c. The company wants to give a reasonable warranty on this tire, yet protect itself so that they won't have to replace more than 7% of the tires. What guarantee (in miles) should the company state in its advertisement for the tires? Assume that the data is normally distributed.