Use limit grouping with the first class of $50-59$and a class width of $10$.

Given data:

The frequency distribution is computed as,

$\begin{array}{|cc|}\hline \text{Limit grouping classes}& \text{Frequency}\\ 50-59& 6\\ 60-69& 3\\ 70-79& 6\\ 80-89& 7\\ 90-99& 3\\ \text{Total}& 25\\ \hline\end{array}$

Given data:

The relative frequency is calculated as follows:
$\text{Relative Frequency}=\frac{\text{Frequency}}{\text{Numberofobservations}}$

$\begin{array}{|ccc|}\hline \text{Limit grouping classes}& \text{Frequency}& \text{Relative Frequency}\\ 50-59& 6& \frac{6}{25}=0.24\\ 60-69& 3& \frac{3}{25}=0.12\\ 70-79& 6& \frac{6}{25}=0.24\\ 80-89& 7& \frac{7}{25}=0.28\\ 90-99& 3& \frac{3}{25}=0.12\\ \text{Total}& 25& 1\\ \hline\end{array}$

Given data:

MINITAB is used to generate the frequency histogram.

The following is the technique for obtaining a frequency histogram:

• Navigate to Graph>Histogram.
• Click OK after selecting Simple.
• Click OK after entering the matching column of DATA in Graph variables.

The output of MINITAB is displayed below.

Given data:

MINITAB is used to generate the relative frequency histogram.

The following is the technique for obtaining a frequency histogram:

• Navigate to Graph>Histogram.
• Click OK after selecting Simple.
• In the Graph variables section, enter the corresponding DATA column.
• Go to Vertical Axis and select TYPE TAB.
• Choose Percentage
• Click OK

The output of MINITAB is displayed below.