The following graph shows the number of vehicles per hour crossing the Tappan Zee Bridge, which spans the Hudson River north of New York City. The graph shows the number of vehicles traveling eastbound (into the city) and westbound (out of the city) as a function of time.

a. Using midpoints on intervals of one hour, estimate the total number of vehicles that cross the bridge going eastbound each day.

b. Repeat the instructions for part a for vehicles going westbound.

c. Discuss whether the answers to parts a and b should be equal, and try to explain any discrepancies.

Transcribed Image Text:

Vehicles per hour 8000 6000 4000 2000 Eastbound: N Mid 2 4 6 8 night 10 noon 2 4 Westbound 6 8 10 Mid- night