The article “Vehicle-Arrival C

The article “Vehicle-Arrival Characteristics at Urban Uncontrolled Intersections” (V. Rangarajan and V. Rao, Journal of Transportation Engineering, 1995: 317–323) presents data on traffic characteristics at 10 intersections in Madras, India. One characteristic measured was the speeds of the vehicles traveling through the intersections. The accompanying table gives the 15th, 50th, and 85th percentiles of speed (in km/h) for two intersections.

a. If a histogram for speeds of vehicles through intersection A were drawn, do you think it would be skewed to the left, skewed to the right, or approximately symmetric? Explain.

b. If a histogram for speeds of vehicles through intersection B were drawn, do you think it would be skewed to the left, skewed to the right, or approximately symmetric? Explain.

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