Mathematics Class Eight   Class 8 Subject List

Solutions of NCERT Exercise

Number System
Exercise 1
Exercise 2
Linear Equations
Problem&Solution:Type1
Exercise 1
Exercise 2
   Part 1     Part 2     Part 3
Exercise 3
   Part 1     Part 2
Exercise 4
   Part 1     Part 2
Exercise 5
   Part 1     Part 2
Exercise 6
   Part 1     Part 2
Quadrilaterals
Exercise 1
Exercise 2
Exercise 3
Exercise 4
Data Handling
Exercise 1
Exercise 2
Probability
Square & Square Roots
Exercise 1
Exercise 2
Exercise 3
   Part 1     Part 2
Exercise 4
Cube & Cube Roots
Exercise 1
Exercise 2
Comparing Quantities
Exercise 1
Exercise 2
Exercise 3
Algebraic Expressions
Exercise 1
Exercise 2 & 3
Exercise 4
Exercise 5
Exponents & Power
Factorization
Exercise 1
Exercise 2
Exercise 3
Mensuration
Mensuration:Problem:Type I
Mensuration:Problem:Type II
Exercise 1
Exercise 2
Exercise 3
Exercise 4
Proportion
Exercise 1
Exercise 2
Introduction to Graphs
Exercise 1
Exercise 2 & 3
Ask Questions




Data Handling

Exercise 2

1. 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.

data handling

From this pie chart answer the following:

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

Answer: When 10 people liked classical music, number of people surveyed is 100

So, When 1 person liked the classical music, number of people surveyed is

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When 20 people like the classical music, number of people surveyed

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

Answer: Light music is liked by maximum number of people.

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

Answer: Number of CD’s for different music

Semi Classical = 1000 x 20% = 200

Classical = 1000 x 10% = 100

Folk = 1000 x 30% = 300

Light = 1000 x 40% = 400

2. A group of 360 people were asked to vote for their favourite season from the three seasons rainy, winter and summer.

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(i) Which season got the most votes?

(ii) Find the central angle of each sector.

(iii) Draw a pie chart to show this information.

Answer: (i) Winter got the most number of votes.

(ii) Central Angle can be calculated as follows:

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(iii) Pie Chart is as follows:

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3. Draw a pie chart showing the following information. The table shows the colours preferred by a group of people.

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Calculate respective proportion of each colour and use that proportion to find the central angle.

Answer: Following is the required pie chart:

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data handling 8

4. The adjoining pie chart gives the marks scored in an examination by a student in Hindi, English, Mathematics, Social Science and Science. If the total marks obtained by the students were 540, answer the following questions. All values are shown in degrees.

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(i) In which subject did the student score 105 marks?

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In the pie chart 70° is the angle for Math, so the student scored 105 marks in math.

(ii) How many more marks were obtained by the student in Mathematics than in Hindi?

Answer: The difference in central angle between Math and Hindi = 90°-70°=20°

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(iii) Examine whether the sum of the marks obtained in Social Science and Mathematics is more than that in Science and Hindi.

Answer: Total of Angles of Social Science and Math = 80°+70°=150°

Total of Angles of Science and Hindi = 65°+90°=155°

It is clear that sum of marks obtained in Social Science and Math is less than that in Science and Hindi.

5. The number of students in a hostel, speaking different languages is given below. Display the data in a pie chart.

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Answer:

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