1. Suppose the average thread-life of a certain brand of tire is 42,000 miles and that this mileage follows the expotential distribution method.What is the probability that a randomly selected tire will have a thread--life of more than 40,000 miles?
2. Johns commute time to work during the week follows the normal probability distribution with a mean time of 26.7 minutesand a standard deviation of 5.1 minutes. What is the probability that the commute time for a randomly selected day will be between 28 and 34 minutes?
3.SUppose the roundtrip airfare between philly and los angeles a month before the departure date follows the normal probability distribution with a mean of $387.20 and a standard deviation of $68.50. Wgat is the probability that a randomly selected airfare between two cities will be between $325 and $425?