Question

Marks of 30 students are listed in the ungrouped distribution as given below.

18, 32, 54, 67, 23, 1, 23, 21, 10, 19, 81, 17, 24, 12, 45, 65, 67, 80, 23, 12, 11, 12, 21, 3, 10, 45, 47, 34, 85, 43.

If this distribution is converted into grouped frequency distribution, what is the length of class interval if number of class interval is 7 ?

• A. 80
• B. 5
• C. 16
• D. 12

Answer 1

The correct option is D 12

Range of the given dataset = Maximum value - Minimum value
= 85 - 1 = 84

Number of class interval given = 7.

$\text{Length of class interval}=\frac{Range}{\text{Number of class interval}}$
= $\frac{84}{\text{7}}$ = 12