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What proportion of passenger vehicles travel slower

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Suppose the distribution of passenger vehicle speeds traveling on the Interstate 5 Freeway (I-5) in California is nearly normal with a mean of 70.2 miles/hour and a standard deviation of 4.85 miles/hour. Round all answers to four decimal places.

1. What proportion of passenger vehicles travel slower than 72 miles/hour?

2. What proportion of passenger vehicles travel between 76 and 84 miles/hour?

3. How fast do the fastest 12% of passenger vehicles travel? miles/hour

4. Suppose the speed limit on this stretch of the I-5 is 65 miles/hour. Approximately what proportion of the passenger vehicles travel above the speed limit on this stretch of the I-5?

Reference no: EM132388467

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