Data collected by the highway patrol indicates that the average speed on a stretch of interstate is 63mph, with a standard deviation of 15. What is the likelihood of observing a vehicle traveling 80...

Data collected by the highway patrol indicates that the average speed on a stretch of interstate is 63mph, with a standard deviation of 15. What is the likelihood of observing a vehicle traveling 80 mph or more? 45 mph or less? If a police officer observed 953 vehicles in an afternoon how many of them (rounded to the nearest whole vehicle) would be traveling 90mph or more?