To find the range, subtract the least value from the greatest value: $\displaystyle{75}-{25}={50}\usepackage{cmbright}\Huge\$ .

To find the midrange, add together the least and the greatest values and divide by 2: $\displaystyle\frac{{{75}+{25}}}{{2}}=\frac{{100}}{{2}}={50}\usepackage{cmbright}\Huge\$

The range and the midrange are both 50.