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Percentage of automobiles are exceeding the speed limit - Findle

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The speed limit on Interstate 75 around Findlay, Ohio, is 65 mph. On a clear day with no construction, the mean speed of automobiles was measured at 63 mph with a standard deviation of 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?

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Solution Summary

The expert determines the percentage of automobiles that are exceeding the speed limit.

Solution Preview

Let X be the random variable for the speed of an individual. X ~ Normal(63, 8).
Let Z be a standard normal ...

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