Question

How many students scored more than or equal to 30 out of 50 marks in a class.
$\begin{array}{cc}Marks& Numberofstudents\\ 0-10& 2\\ 10-20& 12\\ 20-30& 21\\ 30-40& 8\\ 40-50& 5\end{array}$

• A. 13
• B. 10
• C. 8
• D. 2

Answer 1

The correct option is A 13

The table below is called a cumulative frequency distribution of the more than type. Here 0, 10, 20, 30, 40, 50 give the lower limits of the respective class intervals.
$\begin{array}{cc}Morethan& Morethantype\\ orequalto& \\ 0& 48\\ 10& 46\\ 20& 34\\ 30& 13\\ 40& 5\end{array}$
From the table we can observe that 13 students scored more than or equal to 30.