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Answers for “为什么在直方图的 9 处放置一条红色垂直线?”

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A red vertical line is placed at 9 on the histogram to mark the 9-hour barbecue deadline threshold. This makes it easier to visually identify the region corresponding to the event where the total time to complete both reports exceeds the deadline.

Conditions: The barbecue is in 9 hours.; The line marks the threshold on the horizontal axis.