Question: A tire manufacturer believes that the tread-life of its snow tires are normally distributed with a mean of 32,000 miles and a standard deviation of 2500 miles. (2pts)

a. If you buy a set of these tires, would it be reasonable for you to hope they’ll last 40,000 miles? Yes or No

b. What proportion of these tires can be expected to last less than 30,000 miles?