Solution:
(i)
$$\begin{tabular}{|l|l|}
\hline Class Interval & Frequency \\
\hline 10-15 & 10 \\
\hline 15-20 & 15 \\
\hline 20-25 & 17 \\
\hline 25-30 & 12 \\
\hline $30-35$ & 10 \\
\hline $35-40$ & 08 \\
\hline
\end{tabular}$$
Steps of construction:
(a) By taking suitable scales, mark the class intervals on $\mathrm{x}$-axis and the frequencies on $\mathrm{y}$-axis.
(b) We need to construct rectangles with class intervals as bases and corresponding frequencies as heights.
(c) Now, join the mid-points of the rectangle to obtain the ogive.
(ii)
$$\begin{tabular}{|l|l|l|l|}
\hline Class Interval (Inclusive) & Class Interval (Exclusive) & Frequency & Cumulative \\
\hline $10-19$ & $9.5-19.5$ & Frequency \\
\hline $20-29$ & 19.5-29.5 & 23 & 23 \\
\hline $30-39$ & 29.5-39.5 & 16 & 39 \\
\hline $40-49$ & 39.5-49.5 & 20 & 54 \\
\hline $50-59$ & 49.5-59.5 & 12 & 74 \\
\hline & & Total & 86 \\
\hline
\end{tabular}$$
Steps of construction:
(a) We need to convert the data into exclusive form. [Here, adjustment factor = 0.5]
(b) By taking suitable scales, mark the class intervals on x-axis and the frequencies on y-axis.
(c) Now, construct rectangles with class intervals as bases and corresponding frequencies as heights.
(d) Now, join the mid-points of the rectangle to obtain the ogive.