Draw a frequency polygon for the following data without using histogram.

$\begin{array}{|ccccccccc|}\hline \text{ Class interval (Marks) }& 10-20& 20-30& 30-40& 40-50& 50-60& 60-70& 70-80& 80-90\\ \text{ Frequency }& 4& 6& 8& 12& 10& 14& 5& 7\\ \hline\end{array}$

 Arrange the given data in ascending and descending order:

$9, 34, 4, 13, 42, 10, 25, 7, 31, 4, 40$

Prepare a frequency table for the data:

$3, 4, 2, 4, 5, 6, 1, 3, 2, 1, 5, 3, 6, 2, 1, 3, 2, 4$

Prepare a grouped frequency table for the data:

$10, 9, 3, 29, 17, 34, 23, 20, 39, 42, 5, 12, 19, 47,18, 19, 27, 7, 13, 40, 38, 24, 34, 15, 40$