The line that divides the box of the box-and-whisker plot is located at about 81 on the number line. This line represents the median of the data set, not the midrange of the data set.

The box-and-whisker plot shows the greatest value of the data set to be 99 and the least value to be 72. Add these values together and divide by 2 to find the midrange: $\displaystyle\frac{{{99}+{72}}}{{2}}=\frac{{171}}{{2}}={85.5}\usepackage{cmbright}\Huge\$ . So it is not true that the midrange is between 80 and 82.