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    NCERT Solutions for Class 7 Maths Chapter 3 Data Handling

    Edited By Ramraj Saini | Updated on Aug 16, 2023 08:19 AM IST

    NCERT Solutions for Maths Chapter 3 Data Handling Class 7- CBSE Free PDF

    NCERT Solutions for Class 7 Maths Chapter 3 Data Handling are discussed here. These NCERT solutions are created by the expert team at Careers360 keeping in mind the latest CBSE syllabus 2023. These solutions are simple and comprehensive and cover step by step solutions to each problem. The solutions of NCERT Class 7 Maths chapter 3 data handling contains 4 exercises with 23 questions. Also along with these, there is an explanation to topic-wise questions in the CBSE NCERT solutions for Maths chapter 3 Data Handling class 7. Questions based on temperatures of cities on a particular day, weekly absentees in a class, etc are explained in the NCERT solutions for Class 7 Maths chapter 3 Data Handling.

    You must go through the NCERT Syllabus for Class 7 Maths before checking the NCERT Class 7 solutions. To perform well in the exam the NCERT Solutions are helpful. Here you will get solutions to four exercises of this chapter. NCERT provides practise questions to enhance the knowledge of the students and the NCERT Solutions for Class 7 is useful.

    NCERT Solutions for Maths Chapter 3 Data Handling Class 7- Important Formulae

    Arithmetic mean (Average) = (Sum of all the observations)/(Total number of observations)

    Mean = (X1 + X2 + X3 + X4 + . . . . . . . +Xn)/n

    Range = Largest value - smallest values

    Mode = Value or values that appear most frequently in a given data set.

    P(E) = (Number of Trials in favour)/(Total number of Trials)

    For more, Download Ebook - NCERT Class 7 Maths: Chapterwise Important Formulas And Points

    NCERT Solutions for Maths Chapter 3 Data Handling Class 7 - Important Points

    Arithmetic Mean (Average): The sum of all observations divided by the total number of observations.

    Range: The difference between the largest and smallest values in a dataset.

    Mode: The value(s) that appear most frequently in a given dataset.

    Median: The middle value of a dataset when arranged in ascending or descending order. For odd datasets, it's the middle value; for even datasets, it's the average of two middle values.

    Frequency: The count of how many times a specific number appears in a dataset.

    Random Experiment: An experiment whose outcome cannot be predicted before it occurs.

    Bar Graph: A visual representation using rectangular bars, where each bar's height corresponds to the frequency of a category.

    Trial: An action that produces one or more outcomes in an experiment.

    Event: A collection of outcomes associated with a random experiment.

    Empirical Probability: The probability of an event E favoring the outcomes, calculated as the number of favorable trials divided by the total number of trials.

    Free download NCERT Solutions for Class 7 Maths Chapter 3 Data Handling PDF for CBSE Exam.

    NCERT Solutions for Maths Chapter 3 Data Handling Class 7

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    NCERT Solutions for Class 7 Maths Chapter 3 Data Handling(Intext Questions and Exercise)

    NCERT Solutions for Maths Chapter 3 Data Handling class 7 Topic 3.5

    Q . Find at least 5 numbers between 1/2 and 1/3

    Answer: Given number are: \frac{1}{2} and \frac{1}{3}

    Their average = \frac{\frac{1}{2} + \frac{1}{3}}{2} = \frac{3+2}{2\times6} = \frac{5}{12}

    Average between \frac{5}{12}\ and\ \frac{1}{3} = \frac{\frac{5}{12} + \frac{1}{3}}{2} = \frac{5+4}{2\times12} = \frac{9}{24}= \frac{3}{8}

    Average between \frac{5}{12}\ and\ \frac{1}{2} = \frac{\frac{5}{12} + \frac{1}{2}}{2} = \frac{5+6}{2\times12} = \frac{11}{24}

    Average between \frac{11}{24}\ and\ \frac{1}{2} = \frac{\frac{11}{24} + \frac{1}{2}}{2} = \frac{11+12}{2\times24} = \frac{23}{48}

    Average between \frac{9}{24}\ and\ \frac{1}{3} = \frac{\frac{9}{24} + \frac{1}{3}}{2} = \frac{9+8}{2\times24} = \frac{17}{48}

    Therefore, 5 numbers between \frac{1}{2} and \frac{1}{3} are:

    \frac{17}{48},\frac{23}{48},\frac{5}{12},\frac{11}{24},\frac{9}{24}


    NCERT Soltions for Class 7 Maths Chapter 3 Data Handling Topic 3.6

    Find the mode of

    (i) 2, 6, 5, 3, 0, 3, 4, 3, 2, 4, 5, 2, 4

    (ii) 2, 14, 16, 12, 14, 14, 16, 14, 10, 14, 18, 14

    Answer: (i) Given,

    2, 6, 5, 3, 0, 3, 4, 3, 2, 4, 5, 2, 4

    Arranging in ascending order:

    0, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 6

    Here, 2, 3 and 4 all occur three times. Therefore, all three are modes of data.

    (ii) Arranging in ascending order:

    2, 10, 12, 14, 14, 14, 14, 14, 14, 16, 16, 18

    Here, 14 occurs 6 times. Therefore, 14 is the mode of the data.

    Find the mode of 2, 14, 16, 12, 14, 14, 16, 14, 10, 14, 18, 14

    Answer: Arranging in ascending order:

    2, 10, 12, 14, 14, 14, 14, 14, 14, 16, 16, 18

    Here, 14 occurs 6 times. Therefore, 14 is the mode of the data.

    Find the mode of the following data:
    12, 14, 12, 16, 15, 13, 14, 18, 19, 12, 14, 15, 16, 15, 16, 16, 15,
    17, 13, 16, 16, 15, 15, 13, 15, 17, 15, 14, 15, 13, 15, 14

    Answer:

    Data Tally bars Number of times
    12 ||| 3
    13 |||| 4
    14 \cancel{||||} 5
    15 \cancel{||||}\cancel{||||} 10
    16 \cancel{||||}| 6
    18 | 1
    19 \ \ | 1

    Clearly, 15 occurs 10 times. Therefore, 15 is the mode of the data.

    Q Sale of English and Hindi books in the years 1995, 1996, 1997 and 1998 are given below: 1643865246855

    Draw a double bar graph and answer the following questions:

    (b) Can you say that the demand for English books rose faster? Justify.

    Answer: 1643865267293

    Yes, the demand for English books rose faster. It can be seen that the difference in height of the two bars keeps on decreasing.

    NCERT Solutions for Maths Class 7 Chapter 3 Data Handling Exercise 3.1

    2. Organise the following marks in a class assessment, in a tabular form.
    4, 6, 7, 5, 3, 5, 4, 5, 2, 6, 2, 5, 1, 9, 6, 5, 8, 4, 6, 7
    (i) Which number is the highest? (ii) Which number is the lowest?
    (iii) What is the range of the data? (iv) Find the arithmetic mean.

    Answer:

    Numbers Frequency
    1 1
    2 2
    3 1
    4 3
    5 5
    6 4
    7 2
    8 1
    9 1

    (i) 9 is the highest number.

    (ii) 1 is the lowest number

    (iii) Range of the data = Highest number - Lowest number

    9-1=8

    (iv) Arithmetic mean = \frac{sum\ of\ observations}{number\ of\ observation}

    = \frac{(1\times1) + (2\times2) + (3\times1)+ (4\times3 )+ (5\times5 )+ (6\times4) + (7\times2)+(8\times1)+(9\times1)}{20}

    \\ = \frac{1 +4 +3 +12+ 25+ 24 +14 +8 +9}{20} \\\\ = \frac{100}{20} \\\\ = 5

    Therefore, the mean of the data is 5

    3. Find the mean of the first five whole numbers.

    Answer: The first five whole numbers are 0, 1,2,3,4

    We know, Arithmetic mean

    =\frac{sum\ of\ observations}{number\ of\ observation}

    \\ = \frac{0+1+2+3+4}{5} \\ = \frac{10}{5} \\ \\ = 2

    Therefore, the mean of the first five whole numbers is 2

    4. A cricketer scores the following runs in eight innings: 58, 76, 40, 35, 46, 45, 0, 100. Find the mean score.

    Answer: Given,

    Runs scored in eight innings = 58, 76, 40, 35, 46, 45, 0, 100

    We know, Arithmetic mean

    =\frac{sum\ of\ observations}{number\ of\ observation}

    \\ = \frac{58+ 76+ 40+ 35+ 46+ 45+ 0+ 100}{8} \\ = \frac{400}{8} \\ \\ = 50

    Therefore, the mean score is 50

    5. Following table shows the points of each player scored in four games: Now answer the following questions: (i) Find the mean to determine A’s average number of points scored per game. (ii) To find the mean number of points per game for C, would you divide the total points by 3 or by 4? Why? (iii) B played in all the four games. How would you find the mean? (iv) Who is the best performer?

    1643866109197

    Answer: Given,

    We know,

    Arithmetic\: mean =\frac{sum\ of\ observations}{number\ of\ observation}

    (i) Therefore, A's average number of points scored per game

    \\ = \frac{14+16+10+10}{4} \\ = \frac{50}{4} \\ \\ = 12.5

    (ii) Number of games C played = 3

    Therefore, to find the mean, we will divide by 3

    Mean of C =

    \\ = \frac{8+11+13}{3} \\ = \frac{32}{3} \\ \\ = 10.67

    (iii) Although he scored 0 in a match, he played all 4 games. Therefore, we will divide by 4.

    Mean of B =

    \\ = \frac{0+8+6+4}{4} \\ = \frac{18}{4} \\ \\ = 4.5

    (iv) Mean of A = 12.5

    Mean of B = 4.5

    Mean of C = 10.67

    Since A has the highest mean, A is the best performer.

    6. The marks (out of 100) obtained by a group of students in a science test are 85, 76, 90, 85, 39, 48, 56, 95, 81 and 75. Find the:

    (i) Highest and the lowest marks obtained by the students.
    (ii) Range of the marks obtained.
    (iii) Mean marks obtained by the group.

    Answer: Given,

    Marks obtained the students = 85, 76, 90, 85, 39, 48, 56, 95, 81, 75

    Arranging in ascending order = 39, 48, 56, 75, 76, 81, 85, 85, 90, 95

    (i) Highest marks obtained = 95

    Lowest marks obtained = 39

    (ii) Range of marks = Highest marks - Lowest marks

    = 95- 39 = 56

    (iii) We know, Arithmetic mean

    =\frac{sum\ of\ observations}{number\ of\ observation}

    \\ = \frac{39+ 48+ 56+ 75+ 76+ 81+ 85+ 85+ 90+ 95}{10} \\ = \frac{730}{10} \\ \\ = 73

    Therefore, mean marks = 73

    7. The enrolment in a school during six consecutive years was as follows:
    1555, 1670, 1750, 2013, 2540, 2820
    Find the mean enrolment of the school for this period.

    Answer: Given,

    Enrolment during 6 consecutive years = 1555, 1670, 1750, 2013, 2540, 2820

    We know, Arithmetic mean

    =\frac{sum\ of\ observations}{number\ of\ observation}

    \\ = \frac{1555+ 1670+ 1750+ 2013+ 2540+ 2820}{6} \\ = \frac{12348}{6} \\ \\ = 2058

    Therefore, the mean enrolment per year is 2058

    8. The rainfall (in mm) in a city on 7 days of a certain week was recorded as follows:
    (i) Find the range of the rainfall in the above data.
    (ii) Find the mean rainfall for the week.
    (iii) On how many days was the rainfall less than the mean rainfall.

    1643865461867

    Answer:

    Given,

    (i) Range = Maximum rainfall - Minimum rainfall

    = 12.2 - 0.0

    = 12.2

    (ii) We know, Arithmetic mean = \frac{sum\ of\ observations}{number\ of\ observation}

    \\ = \frac{0.0+12.2+2.1+0.0+20.5+5.5+1.0}{7} \\ = \frac{41.3}{7} \\ \\ = 5.9

    Therefore, mean rainfall is 5.9\ mm

    (iii) Here, mean = 5.9\ mm

    Mon(0.0), Wed(2.1), Thu(0.0), Sat(5.5), Sun(1.0) are less than the mean

    Therefore, on 5 days, rainfall was less than the mean.

    9. The heights of 10 girls were measured in cm and the results are as follows:
    135, 150, 139, 128, 151, 132, 146, 149, 143, 141.
    (i) What is the height of the tallest girl? (ii) What is the height of the shortest girl?
    (iii) What is the range of the data? (iv) What is the mean height of the girls?
    (v) How many girls have heights more than the mean height?

    Answer: Given,

    Heights of 10 girls (in cm) = 135, 150, 139, 128, 151, 132, 146, 149, 143, 141

    Arranging the above data in ascending order = 128, 132, 135, 139, 141, 143, 146, 149, 150, 151

    (i) Height of the tallest girl = 151\ cm

    (ii) Height of the shortest girl = 128\ cm

    (iii) Range of the data = (151 -128)\ cm

    = 23\ cm

    (iv) We know, Arithmetic mean = \frac{sum\ of\ observations}{number\ of\ observation}

    \\ = \frac{128+ 132+ 135+ 139+ 141+ 143+ 146+ 149+ 150+ 151}{10} \\ = \frac{1414}{10} \\ \\ = 141.4\ cm

    Therefore, the mean height of the girls is 141.4\ cm

    (iv) Here, mean height = 141.4\ cm

    And, 143, 146,149,150,151 are more than 141.4

    Therefore, 5 girls have a height more than the average height.

    NCERT Solutions for Class 7 Chapter 3 Maths Data Handling Exercise 3.2

    1. The scores in mathematics test (out of 25) of 15 students is as follows:
    19, 25, 23, 20, 9, 20, 15, 10, 5, 16, 25, 20, 24, 12, 20
    Find the mode and median of this data. Are they same?

    Answer: Scores of 15 students are : 19, 25, 23, 20, 9, 20, 15, 10, 5, 16, 25, 20, 24, 12, 20

    Arranging the data in ascending order = 5, 9, 10, 12, 15, 16, 19, 20, 20, 20, 20, 23, 24, 25, 25

    We know,

    Mode: The number which occurs most frequently.

    Median: Median is the mid-value of the set of numbers.

    Here, 20 occurs 4 times, therefore 20 is the mode of the data.

    Also, the middle value is 20.

    Therefore, the median of the data is 20.

    Yes, the median and mode of this data are the same.

    2. The runs scored in a cricket match by 11 players is as follows:
    6, 15, 120, 50, 100, 80, 10, 15, 8, 10, 15
    Find the mean, mode and median of this data. Are the three same?

    Answer: Runs scored in the match = 6, 15, 120, 50, 100, 80, 10, 15, 8, 10, 15

    Arranging in ascending order = 6, 8, 10, 10, 15, 15, 15, 50, 80, 100, 120,

    Here, 15 occurs the maximum number of times. Hence, 15 is the mode of the data

    Now,

    Mean =\frac{Sum\ of\ scores}{Number\ of\ players}

    \\ = \frac{6+ 8+ 10+ 10+ 15+ 15+ 15+ 50+ 80+ 100+ 120}{11} \\ = \frac{429}{11} = 39

    Therefore the mean score is 39

    Now, the median is the middle observation of the data.

    There are 11 terms. Therefore the middle observation is \frac{11+1}{2} = 6^{th }\ term

    Therefore, 15 is the median of the data.

    No, they are not the same.

    3. The weights (in kg.) of 15 students of a class are:
    38, 42, 35, 37, 45, 50, 32, 43, 43, 40, 36, 38, 43, 38, 47
    (i) Find the mode and median of this data.
    (ii) Is there more than one mode?

    Answer: Given, weights of 15 students (in kg)= 38, 42, 35, 37, 45, 50, 32, 43, 43, 40, 36, 38, 43, 38, 47

    Arranging the data in ascending order = 32, 35, 36, 37, 38, 38, 38, 40, 42, 43, 43, 43, 45, 47, 50

    (i) Clearly, 38 and 43 both occur thrice. So, they both are the mode of the data.

    Now, there are 15 values, so the median is the \frac{15+1}{2} = 8^{th}\ term

    Hence, 40 is the median value.

    (ii) Yes, there are two modes of the data given.

    4. Find the mode and median of the data: 13, 16, 12, 14, 19, 12, 14, 13, 14

    Answer: Given, 13, 16, 12, 14, 19, 12, 14, 13, 14

    Arranging in ascending order = 12, 12, 13, 13, 14, 14, 14, 16, 19

    We know,

    The mode is the observation which occurs a maximum number of times.

    Median is the middle observation when that data is arranged in ascending or descending order.

    Now,

    Clearly, 14 occurs thrice. So, 14 is the mode of the data.

    Now, there are 9 values, so the median is the \frac{9+1}{2} = 5^{th}\ term

    Hence, 14 is the median value .

    5. Tell whether the statement is true or false:
    (i) The mode is always one of the numbers in a data.
    (ii) The mean is one of the numbers in a data.
    (iii) The median is always one of the numbers in a data.
    (iv) The data 6, 4, 3, 8, 9, 12, 13, 9 has mean 9.

    Answer: (i) True.

    The mode is the observation which occurs maximum number of times.

    Hence, the mode will always be one of the numbers in data.

    (ii) False.

    (iii) False.

    For even number of observations, the median is the mean of the \frac{n}{2}^{th} and \left (\frac{n+1}{2} \right )^{th} values.

    (iv) Mean = \frac{Sum\ of\ observations}{Number\ of\ observations}

    \\ = \frac{6+ 4+ 3+ 8+ 9+ 12+ 13+ 9}{8} \\ = \frac{64}{8} \\ \\ = 8

    Hence, the statement is false.

    NCERT Solutions for Class 7 Chapter 3 Maths Data Handling Exercise 3.3

    1. Use the bar graph (Fig 3.3) to answer the following questions.
    (a) Which is the most popular pet? (b) How many students have dog as a pet?
    1643865502946

    Answer:

    (a) The bar graph represents the pets owned by the students of class seven.

    And, The bar of the cat is the tallest

    Hence, the cat is the most popular pet.

    (b) The bar of the dog reaches the value 8

    8 students have a dog as a pet.

    2. Read the bar graph (Fig 3.4) which shows the number of books sold by a bookstore during five consecutive years and answer the following questions:
    (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?

    Answer:

    (i) Observing the graph,

    Number of books sold in 1989 = 180

    Number of books sold in 1992 = 220

    Number of books sold in 1990 = 480

    (ii) 475 books were sold in the year 1990

    225 books were sold in the year 1992

    (iii) The years in which the total number of books sold was less than 250 are 1989 and 1992.

    (iv) Around 175 books were sold in the year 1989.

    By drawing a line from the top of 1989 bar to the y-axis.

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

    1643865609586

    (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 eight.

    Answer:

    1643865634230

    (a) The scale : 1 unit = 10 children.

    (b) (i) Class fifth has the maximum number of children.

    Whereas, class tenth has the minimum number of children

    (ii) Number of students in class sixth = 120

    Number of students in class eight = 100

    Therefore, the required ratio = \frac{120}{100}

    = \frac{6}{5}

    Required ratio is 6:5

    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:

    1643865707971

    (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?

    Answer:

    1643865724377

    (i) According to the graph, Maths had the maximum increase in marks.

    Hence,

    The child improved his performance the most in Maths.

    (ii) According to the graph, S.Science had the least increase in marks.

    Hence,

    The child improved his performance the least in S.Science.

    (iii) According to the graph, Hindi's marks went down in the second term

    Hence,

    The child’s performance has gone down in Hindi.

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

    (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?

    1643865792484

    Answer:

    (i)

    1643865816215

    The double bar graph represents the number of people who like watching and participating in various sports.

    We observe that,

    The maximum number of people like either watching or participating in cricket.

    The minimum number of people like either watching or participating in athletics.

    (ii) According to the graph, the tallest bar is of cricket. Hence, cricket is the most popular sport.

    (iii) The bars corresponding to watching sports are longer than the bars corresponding to participating in sports.

    Hence, watching sports is preferred over participating in sports.

    6. Take the data giving the minimum and the maximum temperature of various cities given in the beginning of this Chapter (Table 3.1). Plot a double bar graph using the data and answer the following:
    (i) Which city has the largest difference in the minimum and maximum temperature on the given date?
    (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 other.
    (iv) Name the city which has the least difference between its minimum and the maximum temperature.

    Answer:

    Table 3.1 is

    1643865844465

    The double bar graph is :

    1643865855024

    (i) From the graph,

    Jammu has the largest difference between the maximum and minimum temperature bars.

    \therefore Jammu is the city with the largest difference in its maximum temperature and minimum temperatures on the given date.

    (ii) The city with the maximum temperature would be the hottest.

    And the city with the least temperature will be the coolest.

    According to the graph, Jammu has the highest maximum temperature bar.

    \therefore Jammu is the hottest city.

    Also, the lowest minimum temperature bar is of Bangalore.

    \therefore Bangalore is the coolest city.

    (iii) Maximum temperature of Bangalore is 28^{\circ}C

    The minimum temperature of Jaipur is 29^{\circ}C

    \therefore The required pair of two cities are: Bangalore and Jaipur

    (iv) Mumbai is a city with the least difference in its maximum temperature and minimum temperatures.

    NCERT Solutions for Class 7 Chapter 3 Maths Data Handling Exercise 3.4

    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.

    Answer: (i) You are older today than yesterday.

    -This event is certain to happen.

    (ii) A tossed coin will land heads up.

    - This event can happen but not certain.

    (iii) A die when tossed shall land up with 8 on top.

    - This event is impossible. A die can only show one of the numbers (1,2,3,4,5,6)

    (iv) The next traffic light seen will be green.

    - This event can happen but not certain.

    (v) Tomorrow will be a cloudy day.

    - This event can happen but not certain.

    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?

    Answer: There are 6 marbles in the box numbered from 1 to 6

    (i) Number of marble with number 2 on it = 1

    \therefore Probability of getting a marble with number 2

    =\frac{number\ of\ favourable\ outcomes}{number\ of\ possible\ outcomes}

    = \frac{1}{6}

    (ii) Number of marble with number 5 on it = 1

    \therefore Probability of getting a marble with number 5

    =\frac{number\ of\ favourable\ outcomes}{number\ of\ possible\ outcomes}

    = \frac{1}{6}

    3. A coin is flipped to decide which team starts the game. What is the probability that your team will start?

    Answer: We know, a coin has two faces: Head and Tail

    One can choose either Head or Tail.

    Therefore, the number of favourable outcomes = 1

    We know, Probability of any outcome

    =\frac{number\ of\ favourable\ outcomes}{number\ of\ possible\ outcomes}

    \therefore P(our\ team\ will\ start\ first) = \frac{1}{2}

    Data Handling Class 7 Maths Chapter 3-Topics

    • Collecting Data
    • Organisation Of Data
    • Representative Values
    • Arithmetic Mean
    • Mode
    • Median
    • Use Of Bar Graphs With A Difference Purpose
    • Chance And Probability

    NCERT Solutions for Class 7 Maths Chapter Wise

    Chapter No.

    Chapter Name

    Chapter 1

    Integers

    Chapter 2

    Fractions and Decimals

    Chapter 3

    Data Handling

    Chapter 4

    Simple Equations

    Chapter 5

    Lines and Angles

    Chapter 6

    The Triangle and its Properties

    Chapter 7

    Congruence of Triangles

    Chapter 8Comparing quantities

    Chapter 9

    Rational Numbers

    Chapter 10

    Practical Geometry

    Chapter 11

    Perimeter and Area

    Chapter 12

    Algebraic Expressions

    Chapter 13

    Exponents and Powers

    Chapter 14

    Symmetry

    Chapter 15Visualising Solid Shapes

    NCERT Solutions for Class 7 Subject Wise

    Some important terms:

    Following are the basic terms delt in the chapter. These terms are important and are used in the NCERT solutions for Class 7 Maths chapter 3 data handling. Also in higher classes, these terms are studied in detail.

    • Arithmetic Mean (A.M.) - The average or arithmetic mean or simply mean is defined by the sum of all observations divided by the number of observations.

    Mean=\frac{Sum \:of\:observations}{Number\:of\:observations}

    • Range- It is the difference between the highest observation and the lowest observation.
    • Mode- Mode refers to the observation in a set of observations that occurs most often. For example, in groups 12, 13, 13, 13, 16, 16, 24 and 30, the number 13 is the mode.
    • Median- In a given data, arranged in order from lowest to highest, the median gives us the middle observation.

    Also Check NCERT Books and NCERT Syllabus here:

    Frequently Asked Question (FAQs)

    1. What is the importance of learning all the concepts covered in the NCERT Solutions for chapter 3 maths class 7?

    It is essential to learn all the concepts presented in Chapter 3 of the NCERT Solutions for Class 7 Maths. These concepts are aligned with the exam pattern and model question paper, ensuring that students are well-prepared for their exams. Therefore, acquiring a thorough understanding of all the concepts in NCERT Solutions for chapter 3 maths class 7 is crucial.

    2. List out the important topics present in NCERT Solutions for Class 7 Maths Chapter 3.

    The NCERT Solutions for Class 7 Maths Chapter 3 encompass the following topics:

    1. Data collection
    2. Data organization
    3. Arithmetic mean
    4. Mode
    5. Mode of large data sets
    6. Median
    7. Utilizing bar graphs for different purposes
    8. Probability and chance

    These concepts hold significant importance from an examination standpoint. They align with the latest CBSE board syllabus and are designed with reference to CBSE question papers and marking schemes.

    3. What is the total number of exercises included in the NCERT Solutions for Class 7 Maths Chapter 3?

    The NCERT Solutions for Class 7 Maths Chapter 3 consist of a total of 4 exercises. The first exercise comprises 9 questions, the second exercise consists of 5 questions with sub-questions, the third exercise includes 5 questions with sub-questions, and the fourth exercise contains 9 questions focusing on the concepts of data handling.

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    A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

    Option 1)

    0.34\; J

    Option 2)

    0.16\; J

    Option 3)

    1.00\; J

    Option 4)

    0.67\; J

    A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

    Option 1)

    2.45×10−3 kg

    Option 2)

     6.45×10−3 kg

    Option 3)

     9.89×10−3 kg

    Option 4)

    12.89×10−3 kg

     

    An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

    Option 1)

    2,000 \; J - 5,000\; J

    Option 2)

    200 \, \, J - 500 \, \, J

    Option 3)

    2\times 10^{5}J-3\times 10^{5}J

    Option 4)

    20,000 \, \, J - 50,000 \, \, J

    A particle is projected at 600   to the horizontal with a kinetic energy K. The kinetic energy at the highest point

    Option 1)

    K/2\,

    Option 2)

    \; K\;

    Option 3)

    zero\;

    Option 4)

    K/4

    In the reaction,

    2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}

    Option 1)

    11.2\, L\, H_{2(g)}  at STP  is produced for every mole HCL_{(aq)}  consumed

    Option 2)

    6L\, HCl_{(aq)}  is consumed for ever 3L\, H_{2(g)}      produced

    Option 3)

    33.6 L\, H_{2(g)} is produced regardless of temperature and pressure for every mole Al that reacts

    Option 4)

    67.2\, L\, H_{2(g)} at STP is produced for every mole Al that reacts .

    How many moles of magnesium phosphate, Mg_{3}(PO_{4})_{2} will contain 0.25 mole of oxygen atoms?

    Option 1)

    0.02

    Option 2)

    3.125 × 10-2

    Option 3)

    1.25 × 10-2

    Option 4)

    2.5 × 10-2

    If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

    Option 1)

    decrease twice

    Option 2)

    increase two fold

    Option 3)

    remain unchanged

    Option 4)

    be a function of the molecular mass of the substance.

    With increase of temperature, which of these changes?

    Option 1)

    Molality

    Option 2)

    Weight fraction of solute

    Option 3)

    Fraction of solute present in water

    Option 4)

    Mole fraction.

    Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is

    Option 1)

    twice that in 60 g carbon

    Option 2)

    6.023 × 1022

    Option 3)

    half that in 8 g He

    Option 4)

    558.5 × 6.023 × 1023

    A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m2 , the number of rotations made by the pulley before its direction of motion if reversed, is

    Option 1)

    less than 3

    Option 2)

    more than 3 but less than 6

    Option 3)

    more than 6 but less than 9

    Option 4)

    more than 9

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