NCERT Solutions(Part - 2) - Data Handling Class 7 Notes | EduRev

Mathematics (Maths) Class 7

Created by: Praveen Kumar

Class 7 : NCERT Solutions(Part - 2) - Data Handling Class 7 Notes | EduRev

The document NCERT Solutions(Part - 2) - Data Handling Class 7 Notes | EduRev is a part of the Class 7 Course Mathematics (Maths) Class 7.
All you need of Class 7 at this link: Class 7

Exercise 3.3 
Ques 1: Use the bar graph (fig 3.3) to answer the following questions:

NCERT Solutions(Part - 2) - Data Handling Class 7 Notes | EduRev

(a) Which is the most popular pet? 
(b) How many students have dog as a pet? 
Ans: (a) Cat is the most popular pet.
(b) 8 students have dog as a pet.

Ques 2: Read the bar graph which shows the number of books sold by a bookstore during five consecutive years and answer the following questions: 

NCERT Solutions(Part - 2) - Data Handling Class 7 Notes | EduRev(i) About how many books were sold in 1989? 1990? 1992? 
(ii) In which year were about 475 books sold? About 225 books sold? 
(iii) In which years were fewer than 250 books sold? 
(iv) Can you explain how you would estimate the number of books sold in 1989? 
Ans: According to the given bar graph,
(i) (a) In 1989, 180 books were sold.
(b) In 1990, 475 books were sold.
(c) In 1992, 225 books were sold.
(ii) In 1990, about 475 books were sold and in 1992, about 225 books were sold.
(iii) In 1989 and 1992 fewer than 250 books were sold.
(iv) By reading the graph, we calculate that 180 books were sold in 1989.

Ques 3: Number of children in six different classes are given below. Represent the data on a bar graph. 

Class

Fifth

Sixth

Seventh

Eighth

Ninth

Tenth

No. of children

135

120

95

100

90

80

(a) How would you choose a scale? 
(b) Answer the following questions. 
(i) Which class has the maximum number of children? And the minimum? 
(ii) Find the ratio of students of class sixth to the students of class eighth.
Ans: Data represented by the bar graph is as follows:

NCERT Solutions(Part - 2) - Data Handling Class 7 Notes | EduRev

(a) Scale: 1 unit = 25 children
(b) (i) Fifth class has the maximum number of children and
Tenth class has the minimum number of children.
NCERT Solutions(Part - 2) - Data Handling Class 7 Notes | EduRev
= 120/100
= 6/5 = 6:5

Ques 4: The performance of a student in 1st term and 2nd term is given. Draw a double bar graph choosing appropriate scale and answer the following: 

Subject

English

Hindi

Maths

Science

S. Science

1st term (MM. 100)

67

72

88

81

73

2nd term (MM (100)

70

65

95

85

75

(i) In which subject has the child improved his performance the most? 
(ii) In which subject is the improvement the least? 
(iii) Has the performance gone down in any subject? 
Ans: Data represented by bar graph is as follows:

NCERT Solutions(Part - 2) - Data Handling Class 7 Notes | EduRev

Difference of marks of 1st term and 2nd term
English = 70 – 67 = 3
Hindi = 65 – 72 = -7
Maths = 95 – 88 = 7
Science = 85 – 81 = 4
S. Science = 75 – 73 = 2
(i) He has most improved in Maths subject.
(ii) In S. Science subject, his improvement is less.
(iii) Yes, in Hindi subject, his performance has gone down.

Ques 5: Consider this data collected from a survey of a colony. 

Favourite Sport

Cricket

Basket Ball

Swimming

Hockey

Athletics

Watching

1240

470

510

423

250

Participating

620

320

320

250

105

(i) Draw a double bar graph choosing an appropriate scale. What do you infer from the bar graph? 
(ii) Which sport is most popular?
(iii) Which is more preferred, watching or participating in sports? 
Ans: Data represented by the double bar graph is as follows:

NCERT Solutions(Part - 2) - Data Handling Class 7 Notes | EduRev

(i) This bar graph represents the number of persons who are watching and participating in their favourite sports.
(ii) Cricket is most popular.
(iii) Watching sports is more preferred.

Ques 6: Take the data giving the minimum and the maximum temperature of various cities given in the beginning of this Chapter. Plot a double bat graph using the data and answer the following: 
Temperature of Cities as on 20.6.2006

City

Ahmedabad

Amritsar

Bangalore

Chennai

Max.

38°C

37°C

28°C

36°C

Min.

29°C

26°C

21°C

27°C

City

Delhi

Jaipur

Jammu

Mumbai

Max.

38°C

39°C

41°C

32°C

Min.

28°C

29“ C

26°C

27°C

(i) Which city has the largest difference in the minimum and maximum temperature on the given data? 
(ii) Which is the hottest city and which is the coldest city? 
(iii) Name two cities where maximum temperature of one was less than the minimum temperature of the order. 
(iv) Name the city which has the least difference between its minimum and the maximum temperature. 
Ans: Data represented by double bar graph is as follows:

NCERT Solutions(Part - 2) - Data Handling Class 7 Notes | EduRev

(i) Jammu has the largest difference in temperature i.e.,
Maximum temperature = 41oC and
Minimum temperature = 26oC.
∴ Difference = 41oC – 26oC = 15oC
(ii) Jammu is the hottest city due to maximum temperature is high and Bangalore is the coldest city due to maximum temperature is low.
(iii) Maximum temperature of Bangalore is 28oC
Minimum temperature of two cities whose minimum temperature is higher than the maximum temperature of Bangalore are Ahemedabad and Jaipur where the minimum temperature is 29oC
(iv) Mumbai has the least difference in temperature i.e.,
Maximum temperature = 32oC and
Minimum temperature = 27oC
∴ Difference = 32oC – 27oC = 5oC

Exercise 3.4 
Ques 1: Tell whether the following is certain to happen, impossible can happen but not certain. 
(i) You are older today than yesterday. 
(ii) A tossed coin will land heads up. 
(iii) A die when tossed shall land up with 8 on top. 
(iv) The next traffic light seen will be green. 
(v) Tomorrow will be a cloudy day. 
Ans: 
(i) It is certain to happen.
(ii) It can happen but not certain.
(iii) It is impossible.
(iv) It can happen but not certain.
(v) It can happen but not certain.

Ques 2: There are 6 marbles in a box with numbers from 1 to 6 marked on each of them. 
(i) What is the probability of drawing a marble with number 2? 
(ii) What is the probability of drawing a marble with number 5? 
Ans: Total marbles from 1 to 6 marked in a box = 6
(i) The probability of drawing a marble with number 2.
⇒ P (drawing one marble) = 1/6
(ii) The probability of drawing a marble with number 5.
⇒ P (drawing one marble) = 1/6

Ques 3: A coin is flipped to decide which team starts the game. What is the probability that your team will start? 
Ans: A coin has two possible outcomes Head and Tail.
Probability of getting Head or Tail is equal.
∴ P (Starting game) = 1/2

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