Question

which type of graph most readily shows the interquartile range for a data set?
bar graphs
box plots
dot plots
histograms

Explanation:

A box - plot, also known as a box - and - whisker plot, has a box that represents the interquartile range (IQR). The lower end of the box is the first quartile ($Q_1$) and the upper end is the third quartile ($Q_3$). The difference $Q_3 - Q_1$ is the IQR. Other graph types do not directly display the IQR in such an intuitive way.

Answer:

B. box plots