A frequency diagram!
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A frequency diagram or, for grouped data, an histogram.
A scatter diagram.
Line Plot
To find the modal group in a back-to-back stem-and-leaf diagram, you need to look for the group with the highest frequency on both sides of the diagram. This group represents the mode for the data set. The mode is the value that appears most frequently in the data. In a back-to-back stem-and-leaf diagram, the modal group will be the one with the highest frequency on both sides of the stem.
A diragram that shows the inside and outside of an object.