A student is taking two courses, history and math. The probability the student will pass the history course is 0.60, and the probability of passing the math course is 0.70. The probability of passing both is 0.50. What is the probability of passing at least one?

The probability that a driver whose vehicle is stopped for a traffic violation is wearing a seatbelt is 0.70. Suppose that three vehicles have just been stopped for traffic violations. What is the probability that all three drivers are wearing seatbelts? Answer in decimal format and round to 3 decimal places.