Traffic crash data show that average number of vehicle miles driven (VMD) between successive (reported) traffic crashes involving the same vehicle can be modeled by a normal random variable with u = 80,000 miles and sigma = 40,000 miles. What is the probability that a vehicle will be driven at least 160,000 miles before crashing? What is the probability that a randomly selected vehicle's VMD will lie between 60,000 and 100,000 miles since its previous crash?