Question

The following table shows the class mark and frequency. Find the highest class interval that the data can have

$\begin{array}{cc}\text{Class Mark}& \text{Frequency}\\ 55& 8\\ 65& 6\\ 75& 18\\ 85& 25\\ 95& 12\end{array}$

• A. 90-100
• B. 50-60
• C. 55-65
• D. 100-105

Answer 1

The correct option is A

90-100

Since the difference between the two consecutive class mark is 10 , subtract $\frac{10}{2}$ = 5 from each class mark to get the lower limit and add 5 to each class mark to get the upper limit. Hence the table will be given as

$\begin{array}{cc}\text{Class Mark}& \text{Frequency}\\ 50-60& 8\\ 60-70& 6\\ 70-80& 18\\ 80-90& 25\\ 90-100& 12\end{array}$

Hence from the table we can observe that the highest class interval the table has is between 90-100