Travel and Transportation In a particularly rural area in upstate New York, 80% of all people use chains on their car tires (for winter driving), 60% carry a snow shovel in their car and use chains, and 15% carry a shovel but do not use chains. Suppose a person from this area is selected at random.
a. If the person uses chains, what is the probability that he carries a shovel? Write a Solution Trail for this problem.
b. Given that the person does not use chains, what is the probability that she carries a shovel?