Question

Following is a table that has distributed the marks of 50 students in a class test.. How many students in the class managed to score between 60-80 marks in the test?
$\begin{array}{cc}Scores& Cumulative\\ & Frequency\\ 0-20& 1\\ 20-40& 12\\ 40-60& 21\\ 60-80& 34\\ 80-100& 50\end{array}$

• A. 22
• B. 34
• C. 13
• D. 16

Answer 1

Answer: (C), (D)

The correct options are
C 13
D 16

In order to get the frequency of the class interval 60-80, we need to find the difference between the cumulative frequency of the class 60-80 and the class preceding it which is 40-60.
Therefore the number of students who scored between 60-80 = 34-21 = 13.