There is an outbreak of the flu at Burak's school.
The graph below represents the number of people at Burak's school, $N$, who have been infected with the flu $t$ days after the initial outbreak.
![](web+graphie://ka-perseus-graphie.s3.amazonaws.com/26d5a74c682dde46c7547526a9596bc1c48da08d)
**Based on the graph, about how many people were infected with the flu during this outbreak?**
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