Question: On election day, the polls in a certain state open at 8:00 A.M. Every 2 hours after that, an election official determines what percentage of

On election day, the polls in a certain state open at 8:00 A.M. Every 2 hours after that, an election official determines what percentage of the registered voters have already cast their ballots. The data through 6:00 P.M. are shown here:

Time Percentage turnout 10:00 12 12:00 19 2:00 24 4:00 30 6:00

a. Plot these data on a graph.

b. Find the equation of the least-squares line. (Let x denote the number of hours after 8:00 A.M.)

c. Use the least-squares line to predict what percentage of the registered voters will have cast their ballots by the time the polls close at 8:00 P.M.

Time Percentage turnout 10:00 12 12:00 19 2:00 24 4:00 30 6:00 37

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