Use limit grouping with the first class of $30-36$and a class width of $7$.

Given data:

The frequency distribution is computed as,

$\begin{array}{|cc|}\hline \text{Limit grouping classes}& \text{Frequency}\\ 30-36& 7\\ 37-43& 2\\ 44-50& 5\\ 51-57& 2\\ 58-64& 2\\ 65-71& 25\\ 72-78& 3\\ \text{Total}& 2\\ \hline\end{array}$

Given data:

The relative frequency is calculated as follows:

$\text{Relative Frequency}=\frac{\text{Frequency}}{\text{Numberofobservations}}$

$\begin{array}{|ccc|}\hline \text{Limit grouping classes}& \text{Frequency}& \text{Relative Frequency}\\ 30-36& 7& \frac{7}{25}=0.28\\ 37-43& 2& \frac{2}{25}=0.08\\ 44-50& 5& \frac{5}{25}=0.20\\ 51-57& 4& \frac{4}{25}=0.16\\ 58-64& 3& \frac{3}{25}=0.12\\ 65-71& 2& \frac{2}{25}=0.08\\ 72-78& 2& \frac{2}{25}=0.08\\ \text{Total}& 25& 1\\ \hline\end{array}$

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.