Speeding on the I-5. Suppose the distributionof passenger vehicle speeds traveling on the Interstate 5 Freeway(I-5) in California is nearly normal with a mean of 73.8 miles/hourand a standard deviation of 4.96 miles/hour. Round all answers tofour decimal places.
What proportion of passenger vehicles travel slower than 64miles/hour?
What proportion of passenger vehicles travel between 63 and 70miles/hour?
How fast do the fastest 10% of passenger vehicles travel?
Suppose the speed limit on this stretch of the I-5 is 75miles/hour. Approximately what proportion of the passenger vehiclestravel above the speed limit on this stretch of the I-5?
