Answer
\begin{array}{c}& \textbf{Donation \$m} & \textbf{Frequency}
\\\hline & \text{12-20} & \text{7}
\\ & \text{21-29} & \text{7}
\\ & \text{30-38} & \text{3}
\\ & \text{39-47} & \text{3}
\\ & \text{48-56} & \text{4}
\\ & \text{57-65} & \text{3}
\\ & \text{66-74} & \text{0}
\\ & \text{75-83} & \text{2}
\\ & \text{84-92} & \text{1}
\end{array}
Work Step by Step
Find the highest and lowest values.
$H=88$
$L=12$
Find the range.
$R=H-L=88-12=76$
Find the class width by dividing the range my the number of classes.
$W=\frac{R}{C}=\frac{76}{9}=8. \overline 4$
Round up.
$W=9$
Add the width to the lowest value to get the lower limit of the next class. Find the upper limit of each class by subtracting 1 from the lower limit of the next class.
$12+9=21$
$21+9=30$
$30+9=39$
$39+9=48$
$48+9=57$
$57+9=66$
$66+9=75$
$75+9=84$
$84+9=93$
Tally the frequency for each category and enter the results in the table.
