Traffic studies have shown that the best speed limit to post on a given road is the 85th percentile speed.
Assume a road engineer collects these data to determine the speed limit on a local street.
a. Draw a histogram for these data.
b. Find the 85th percentile speed.
c. What speed limit would you recommend based on this traffic study?
d. What other factors should be considered in determining a speed limit?

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Speed (mi/h) 13-15 16-18 19-21 22-24 25-27 28-30 Number of Cars SpeedNumber of Cars (mi/h) 31-33 34-36 37-39 40-42 43-45 46-48 (frequency) (frequency) 17 13 15 21