What type of graph shows the frequencies of an event?

A bar graph is specifically designed to visually represent the frequencies of different events or categories. In a bar graph, each category is represented by a separate bar, and the height or length of the bar correlates with the frequency of that category. This makes it easy to compare the frequencies at a glance, as you can visually assess which events or categories occur more or less frequently based on the size of the bars.

Other types of graphs serve different purposes. A line graph is typically used to show trends over time, making it suitable for continuous data but not for comparing discrete frequencies directly. A pie chart represents proportions of a whole, which is useful for understanding how different categories contribute to a total but does not easily display frequency comparisons. A scatter plot is used to show relationships between two variables, focusing on the correlation between data points rather than showing frequency distributions. Therefore, the bar graph is the most effective choice for showing the frequencies of an event.