A stadium is holding a festival. When the gates are opened, the total number of people in the stadium is recorded every 20 minutes over a 3-hour period. The results are shown in the table.

a. Plot a line graph to show the total number of people in the stadium over the 3-hour period.
b. Use your graph to estimate the number of people in the stadium after 1 1
2 hours.
c. Use your graph to estimate the number of people who entered the stadium between the 50th and 90th minutes after the gates opened.

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Time (mins) Total number of people 0 20 40 60 80 100 120 140 160 180 0 3000 10000 18000 22000 36000 40000 44000 45000 46000