Final answer:
A histogram is used in the graphical representation. It shows the distribution of a set of continuous data, in this case, the resting pulse rates of students in a high school health class.
Step-by-step explanation:
The graphical representation used in the question is a histogram.
A histogram is a type of bar chart that displays the distribution of a set of continuous data. In this case, the histogram shows the frequency or count of the resting pulse rates of students in a high school health class. The horizontal axis represents the range of pulse rates, divided into intervals or bins, and the vertical axis represents the frequency or count of students falling within each bin.
Unlike a bar chart, which can represent any categorical or quantitative data, a histogram specifically represents the distribution of continuous data.