Class 8 Maths Data Handling Pie Chart

Circle Graph or Pie Chart

A circle graph or pie chart shows the relationship between a whole and its parts.

  • A circle is divided in sectors.
  • Size of each sector is proportional to the activity or information it represents.

For example, daily routine of a student is represented below.

Problem: A survey was made to find the type of music that a certain group of young people liked in a city.

Adjoining pie chart shows the findings of this survey.

 

From this pie chart, answer the following:

(i) If 20 people liked classical music, how many young people were surveyed?

(ii) Which type of music is liked by the maximum number of people?

(iii) If a cassette company were to make 1000 CD’s, how many of each type would they make?

Solution:

(i) 10% of total is 20. or (10/100) x Total = 20

Therefore Total = 100 x 20 / 10 = 200 people

Hence, 200 people were surveyed.

(ii) Light music is liked by the maximum number of people.

(iii) CD’s of classical music = 10 x 1000 / 100 = 100

CD’s of semi-classical music = 20 x 1000 / 100 = 200

CD’s of light music = 40 x 1000 / 100 = 400

CD’s of folk music = 30 x 1000 / 100 = 300

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