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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