Question

Marks of 30 students are listed in the ungrouped distribution as given below.
13, 32, 45, 67, 23, 18, 23, 21, 10, 19,18, 17, 24, 12, 45, 56, 76, 80, 23, 12, 11, 12, 19, 15, 19, 54, 74, 34, 58, 34.

If this distribution is converted into a grouped frequency distribution, what is the length of the class interval if the number of the class interval is 5?

• A. 80
• B. 5
• C. 14
• D. 12

Answer 1

The correct option is C 14

At first we will find the value of range by using the below formula.

Range = Maximum value - Minimum value
= 80 - 10
= 70

We are given that the number of the class interval is 5.

Length of class interval
= $\frac{Range}{\text{Number of class interval}}$
= $\frac{70}{\text{5}}$ = 14