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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.

Meet the concept

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Setting `density=True` in `plt.hist` normalizes the bar heights so that the plotted histogram represents an empirical probability density estimate of the simulated total durations, rather than raw counts.

Conditions: Used when the goal is to compare the sample distribution with probability-density scale.; The plotted bars are normalized by bin width and sample size.

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The video computes the total time to complete both reports by performing an elementwise addition of the two simulated completion-time arrays. The total time is simply their summation, represented in code as `duration = A+BA + B`.

Conditions: A and B must be arrays of the same length.; Addition is performed entrywise across matched simulation runs.