The marks out of 50, obtained by 30 students of a class in an examination are given below :
$
\begin{array}{l}
40,12,46,37,17,27,30,6,2,23,19,39,25,5,33 \\
19,21,12,41,17,12,19,17,8,10,1,9,21,13,48
\end{array}
$
Arrange them in ascending order and present it as a grouped data, by taking class-intervals $0-10,10-20,20-30,30-40,40-50$
→