Question

solve the following questions​

Answer 1

$\begin{gathered}\begin{gathered}\begin{gathered}\begin{gathered}\begin{gathered}\boxed{\begin{array}{c|c|c} \qquad&\qquad&\qquad \\ \sf Class( Marks)&\sf Frequency&\sf Less~ than ~type ~\\&& \sf communicative ~ frequency \\ \hline \sf 30-40& \sf14& \sf14\\\hline \sf40-50&\sf20&\sf34 \\ \hline \sf50-60 &\sf 11&\sf 45\\\hline \sf60-70&\sf 12&\sf 57 \\\hline \sf70-80&\sf 9&\sf 66\\\hline \sf80-90&\sf 2&\sf 68\end{array}} \\ \sf Total\ No. = 68 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \end{gathered}\end{gathered}\end{gathered}\end{gathered}\end{gathered}$

(i) The number of students, who have scored marks less than 80 is 66.

(ii) The number of students who have scored marks less than 40 is 14.

(iii) The number of students who have scored marks less than 60 is 45.