Use cutpoint grouping with a first class of $10$-under $15$.

Given data:

The frequency distribution is computed as,

$\begin{array}{|cc|}\hline \text{Cut-point grouping classes}& \text{Frequency}\\ \text{10-under 15}& 4\\ \text{15-under}20& 5\\ \text{20-under}25& 7\\ \text{25-under}30& 3\\ 30-\text{under}35& 0\\ 35-\text{under}40& 1\\ \text{Total}& 20\\ \hline\end{array}$

Given data:

The relative frequency is calculated as follows:

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

$\begin{array}{|ccc|}\hline \text{Cut-point grouping classes}& \text{Frequency}& \text{Relative Frequency}\\ \text{10-under}15& 4& \frac{4}{20}=0.20\\ 15\text{-under}20& 5& \frac{5}{20}=0.25\\ \text{20-under}25& 7& \frac{7}{20}=0.35\\ 25\text{-under}30& 3& \frac{3}{20}=0.15\\ 30\text{-under}35& 0& \frac{0}{20}=0\\ 35\text{-under}40& 1& \frac{1}{20}=0.05\\ \text{Total}& 20& 1\\ \hline\end{array}$

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.