#### Chapters

Chapter 2 : Exponents of Real Numbers

Chapter 3 : Rationalisation

Chapter 4 : Algebraic Identities

Chapter 5 : Factorisation of Algebraic Expressions

Chapter 6 : Factorisation of Polynomials

Chapter 7 : Introduction to Euclid’s Geometry

Chapter 8 : Lines and Angles

Chapter 9 : Triangle and its Angles

Chapter 10 : Congruent Triangles

Chapter 11 : Co-ordinate Geometry

Chapter 12 : Heron’s Formula

Chapter 13 : Linear Equations in Two Variables

Chapter 14 : Quadrilaterals

Chapter 15 : Areas of Parallelograms and Triangles

Chapter 16 : Circles

Chapter 17 : Constructions

Chapter 18 : Surface Areas and Volume of a Cuboid and Cube

Chapter 19 : Surface Areas and Volume of a Circular Cylinder

Chapter 20 : Surface Areas and Volume of A Right Circular Cone

Chapter 21 : Surface Areas and Volume of a Sphere

Chapter 22 : Tabular Representation of Statistical Data

Chapter 23 : Graphical Representation of Statistical Data

Chapter 24 : Measures of Central Tendency

Chapter 25 : Probability

## Chapter 23 : Graphical Representation of Statistical Data

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Read the bar graph shown in Fig. 23.8 and answer the following questions:

(i) What is the information given by the bar graph?

(ii) How many tickets of Assam State Lottery were sold by the agent?

(iii) Of which state, were the maximum number of tickets sold?

(iv) State whether true or false.

The maximum number of tickets sold is three times the minimum number of tickets sold.

(v) Of which state were the minimum number of tickets sold?

Study the bar graph representing the number of persons in various age groups in a town shown in Fig. below. Observe the bar graph and answer the following questions:

(i) What is the percentage of the youngest age-group persons over those in the oldest age

group?

(ii) What is the total population of the town?

(iii) What is the number of persons in the age group 60 - 65?

(iv) How many persons are more in the age-group 10 - 15 than in the age group 30 - 35?

(v) What is the age-group of exactly 1200 persons living in the town?

(vi) What is the total number of persons living in the town in the age-group 50 - 55?

(vii) What is the total number of persons living in the town in the age-groups 10 - 15 and 60 - 65?

(viii) Whether the population in general increases, decreases or remains constant with the

increase in the age-group.

Read the bar graph shown in Fig. 23.10 and answer the following questions

(i) What is the information given by the bar graph?

(ii) What was the number of commercial banks in 1977?

(iii) What is the ratio of the number of commercial banks in 1969 to that in 1980?

(iv) State whether true or false:

The number of commercial banks in 1983 is less than double the number of

commercial banks in 1969.

Given below (Fig. below) is the bar graph indicating the marks obtained out of 50 in mathematics paper by 100 students. Read the bar graph and answer the following questions:

(i) It is decided to distribute work books on mathematics to the students obtaining

less than 20 marks, giving one workbook to each of such students. If a work book

costs Rs 5, what sum is required to buy the work books?

(ii) Every student belonging to the highest mark group is entitled to get a prize of Rs. 10.

How much amount of money is required for distributing the prize money?

(iii) Every student belonging to the lowest mark—group has to solve 5 problems per day.

How many problems, in all, will be solved by the students of this group per day?

(iv) State whether true or false.

a. 17% students have obtained marks ranging from 40 to 49.

b. 59 students have obtained marks ranging from 10 to 29.

(v) What is the number of students getting less than 20 marks?

(vi) What is the number of students getting more than 29 marks?

(vii) What is the number of students getting marks between 9 and 40?

(viii) What is the number of students belonging to the highest mark group?

(ix) What is the number of students obtaining more than 19 marks?

Read the following bar graph (Fig. 23.12) and answer the following questions:

(i) What is the information given by the bar graph?

(ii) State each of the following whether true or false.

a. The number of government companies in 1957 is that of 1982 is 1 :9.

b. The number of government companies have decreased over the year 1957 to

1983.

Read the following bar graph and answer the following questions:

(i) What information is given by the bar graph?

(ii) Which state is the largest producer of rice?

(iii) Which state is the largest producer of wheat?

(iv) Which state has total production of rice and wheat as its maximum?

(v) Which state has the total production of wheat and rice minimum?

The following bar graph (Fig. 23. 1 4) represents the heights (in cm) of 50 students of Class

XI of a particular school. Study the graph and answer the following questions:

(i) What percentage of the total number of students have their heights more than 149cm?

(ii) How many students in the class are in the range of maximum height of the class?

(iii) The school wants to provide a particular type of tonic to each student below the height

of 150 cm to improve his height. If the cost of the tonic for each student comes out

to be Rs. 55, how much amount of money is required?

(iv) How many students are in the range of shortest height of the class?

(v) State whether true or false:

a. There are 9 students in the class whose heights are in the range of 155 - 159 cm.

b. Maximum height (in cm) of a student in the class is 17.

c. There are 29 students in the class whose heights are in the range of 145- 154 cm.

d. Minimum height (in cm) of a student is the class is in the range of 140 – 144 cms.

e. The number of students in the class having their heights less than 150 cm is 12.

f. There are 14 students each of whom has height more than 154. cm.

Read the following bar graph(Fig. 23.15)and answer the following questions:

(i) What information is given by the bar graph?

(ii) What was the production of a student in the year 1980 - 81?

(iii) What is the minimum and maximum productions of cement and corresponding years?

The bar graph shown in Fig 23.16 represents the circulation of newspapers in 10 languages. Study the bar graph and answer the following questions:

(i) What is the total number of newspapers published in Hindi, English, Urdu, Punjabi

and Bengali?

(ii) What percent is the number of news papers published in Hindi of the total number of

newspapers?

(iii) Find the excess of the number of newspapers published in English over those

published in Urdu.

(iv) Name two pairs of languages which publish the same number of newspapers.

(v) State the language in which the smallest number of newspapers are published.

(vi) State the language in which the largest number of newspapers are published.

(vii) State the language in which the number of newspapers published is between 2500

and 3500.

(viii) State whether true or false:

a. The number of newspapers published in Malayalam and Marathi together is less

than those published in English.

b. The number of newspapers published in Telugu is more than those published in

Tamil.

Read the bar graph given in Fig. 23.17 and answer the following questions:

(i) What information is given by the bar graph?

(ii) What was the crop-production of rice in 1970 - 71?

(iii) What is the difference between the maximum and minimum production of rice?

Read the bar graph given in Fig. below and answer the following questions:

(i) What information does it give?

(ii) In which part the expenditure on education is maximum in 1980?

(iii) In which part the expenditure has gone up from 1980 to 1990?

(iv) In which part the gap between 1980 and 1990 is maximum?

Read the bar graph given in Fig. 23.19 and answer the following questions:

(i) What information is given by the bar graph?

(ii) In which years the areas under the sugarcane crop were the maximum and the minimum?

(iii) State whether true or false:

The area under the sugarcane crop in the year 1982 - 83 is three times that of the year 1950 - 51

Read the bar graph given in Fig. 23.20 and answer the fol1owing questions:

(i) What information is given by the bar graph?

(ii) What was the expenditure on health and family planning in the year 1982-83?

(iii) In which year is the increase in expenditure maximum over the expenditure in

previous year? What is the maximum increase?

Read the bar graph given in Fig. 23.21 and answer the following questions:

(i) What is the information given by the bar graph?

(ii) What is the number of families having 6 members?

(iii) How many members per family are there in the maximum number of families? Also

tell the number of such families.

(iv) What are the number of members per family for which the number of families are

equal? Also, tell the number of such families?

Read the bar graph given in Fig. 23.22 and answer the following questions:

^{}

(i) What information is given by the bar graph?

(ii) Which Doordarshan centre covers maximum area? Also tell the covered area.

(iii) What is the difference between the areas covered by the centres at delhi and Bombay?

(iv) Which Doordarshan centres are in U.P State? What are the areas covered by them?

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Explain the reading and interpretation of bar graphs.

Read the following bar graph and answer the following questions:

(i) What information is given by the bar graph?

(ii) In which year the export is minimum?

(iii)In which year the import is maximum?

(iv)In which year the difference of the values of export and import is maximum?

The following bar graph shows the results of an annual examination in a secondary school. Read the bar graph (Fig. 23.28) and choose the correct alternative in each of the following:

(i) The pair of classes in which the results of boys and girls are inversely proportional are:

(a) VI, VIII (b) VI, IX (c) VIII, IX (d) VIII, X

(ii) The class having the lowest failure rate of girls is

(a) VII (b) X (c) IX (d) VIII

(iii)The class having the lowest pass rate of students is

(a) VI (b) VII (c) VIII (d) IX

#### Textbook solutions for Class 9

## RD Sharma solutions for Class 9 Mathematics chapter 23 - Graphical Representation of Statistical Data

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Concepts covered in Class 9 Mathematics chapter 23 Graphical Representation of Statistical Data are Measures of Central Tendency, Graphical Representation of Data, Presentation of Data, Collection of Data, Introduction of Statistics.

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