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# The class marks of a frequency distribution are given as follows :

15, 20, 25, ...

The class corresponding to the class mark 20 is:

a. 12.5 - 17.5

b. 17.5 - 22.5

c. 18.5 - 21.5

d. 19.5 - 20.5

**Solution:**

We know that

Width = 5

Class marks = 20

We can calculate

Lower limit = 20 - 5/2

= (40 - 5)/2

= 35/2

= 17.5

In the same way

Upper limit = 20 + 5/2

= (40 + 5)/2

= 45/2

= 22.5

Therefore, the class corresponding to the class mark 20 is 17.5 - 22.5.

**✦ Try This: **The class marks of a frequency distribution are given as follows : 10, 20, 30, ... The class corresponding to the class mark 15 is :

a. 12.5 - 17.5

b. 17.5 - 22.5

c. 18.5 - 21.5

d. 19.5 - 20.5

**☛ Also Check:** NCERT Solutions for Class 9 Maths Chapter 14

**NCERT Exemplar Class 9 Maths Exercise 14.1 Problem 6**

## The class marks of a frequency distribution are given as follows : 15, 20, 25, ...The class corresponding to the class mark 20 is : a. 12.5 - 17.5, b. 17.5 - 22.5, c. 18.5 - 21.5, d. 19.5 - 20.5

**Summary:**

The class marks of a frequency distribution are given as follows : 15, 20, 25, ... The class corresponding to the class mark 20 is 17.5 - 22.5

**☛ Related Questions:**

- In the class intervals 10-20, 20-30, the number 20 is included in : a. 10-20, b. 20-30, c. both the . . . .
- A grouped frequency table with class intervals of equal sizes using 250-270 (270 not included in thi . . . .
- A grouped frequency distribution table with classes of equal sizes using 63-72 (72 included) as one . . . .

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