The speed limit on Interstate 75 around Findlay, Ohio, is 65 mph. On a clear day with no construction, the meanspeed of automobiles was measured at 63 mph with a standard deviationof 8 mph. If the speeds are normally distributed, what percentage of the automobiles are exceeding the speed limit? If the Highway Patrol decides to ticket only motorists exceeding 72 mph, what percentage of the motorists might they arrest?
Let X be the random variable for the speed of an individual. X ~ Normal(63, 8).
Let Z be a standard normal …
The expert determines the percentage of automobiles that are exceeding the speed limit.