The double bar graph given below compares the class-averages in half yearly and annual examinations of 5 sections of Class VII.
Observe the graph carefully and tell which section showed the most improvement and by how much?

Solution:

Given, the double bar graph compares the class-averages in half yearly and annual examinations of 5 sections of Class VII.

We have to determine the section which showed the most improvement and by how much.

The difference of the annual examination results and the half yearly examination results for each section,

Section A = 75 - 62 = 13

Section B = 66 - 58 = 8

Section C = 56 - 70 = -14

Section D = 82 - 74 = 8

Section E = 65 - 69 = -4

We observe that section A has maximum difference.

The difference is 13.

Therefore, Section A shows the most improvement by 13.

✦ Try This: The cards bearing letters of the word “TRANSVERSAL” are placed in a bag. A card is taken out from the bag without looking into the bag (at random). What is the probability of getting any vowel?

☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 3

NCERT Exemplar Class 7 Maths Chapter 3 Sample Problem 17

The double bar graph given below compares the class-averages in half yearly and annual examinations of 5 sections of Class VII. Observe the graph carefully and tell which section showed the most improvement and by how much

Summary:

On observing the graph carefully, it is clear that section A showed the most improvement and the difference is 13

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