The mean life span of a brand name tire is 50,000 miles. Assume
that the life spans of the tires are normally distributed, and the
population standard deviation is 800 miles.
a. If you select one tire, what is the probability that its
life span is less than 48,500 miles?
b. If you select 100 tires, what is the probability that their
mean life span is more than 50,200miles?
c. What is the distribution of the sample mean in part...