In the class intervals 10-20, 20-30, the number 20 is included in :
a. 10-20
b. 20-30
c. both the intervals
d. none of these intervals

Solution:

The class interval 10-20 is the first interval

20-30 is the next one

20 is present in both the intervals

We know that

20 is completely not present in 10-20

20 is completely present in 20-30

Therefore, the number 20 is included in 20-30.

✦ Try This: In the class intervals 20-30, 30-40, the number 30 is included in :
a. 20-30
b. 30-40
c. both the intervals
d. none of these intervals

The class interval 20-30 is the first interval

30-40 is the next one

30 is present in both the intervals

We know that

30 is completely not present in 20-30

30 is completely present in 30-40

Therefore, the number 30 is included in 30-40.

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

NCERT Exemplar Class 9 Maths Exercise 14.1 Problem 7

In the class intervals 10-20, 20-30, the number 20 is included in : a. 10-20, b. 20-30, c. both the intervals, d. none of these intervals

Summary:

Class interval is defined as the size of each class of numerical data in a large frequency distribution following a specific width. In the class intervals 10-20, 20-30, the number 20 is included in 20-30

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