Important Questions Class 8 Maths Part 2 Chapter 5 Tales by Dots and Lines
Important Questions Class 8 Maths Part 2 Chapter 5 Tales by Dots and Lines
Tales by Dots and Lines is Chapter 5 of the Class 8 Maths book Ganita Prakash Part 2. It is about collecting, arranging and showing data. Students organise data in tables, read and draw bar graphs and line graphs, and find the mean, median and mode of a set of numbers.
This page gives 12 important questions from Class 8 Maths Part 2 Chapter 5 Tales by Dots and Lines with step-by-step answers prepared by Extramarks experts. The questions cover organising data, bar graphs and line graphs, and finding the mean, median and mode. Solve each question on paper first and then check your working with the answer.
Q1. Mayank surveyed traffic in front of his village house for 1 hour.
Draw a bar graph of this data.
Answer:
Q2. The following pictograph shows the number of students of class VI in a school, using the different means of transport to travel to school.
Find:
(a) Number of Students coming by Car.
(b) The Most Popular way of traveling used by the students.
(c) Which means of transport is used by the minimum number of students
(d) How many students are using the transport other than Car, School Bus, Cycle.
Answer: (a) 40 students are coming by car.
(b) School Bus is the most popular way of traveling used by students.
(c) Cycle is the means of transport used by minimum number of students.
(d) 120 students are using other transport facilities.
Q3. Following bar-graph shows favourite TV channel of all the people of a city.
What is the total population of the city?
Answer: Total population of the city
= Sum of the number represented by each bar
= 12,000 + 8,000 + 6,000 + 10,000
= 36,000
Thus, the total population of the city is 36,000.
Q4. Given Bar-Graph , represent the amount of oil purchased by the government from 1998-2005, Read the Graph and give your observation under following topics:
a) In which year maximum oil purchased ?
b) In which year minimum oil purchased ?
Answer: Maximum oil purchased in 2005.
Minimum oil purchased in 1998.
Q5. Following data shows the number of cars in four societies.
Represent the data with the help of a pictogram.
Answer: This data shows the number of cars of four societies.
Use one picture of a car to represent 200 cars, and half of the picture to represent 100 cars.
In the society Orange county, there are 1300 cars, so six full pictures and one half picture is used to represent this number.
Similarly, other numbers are represented in the pictogram.
Q6. In a survey, four people are asked about their ages. Based on their responses following bar graph is made.
(a) Who is the eldest among the surveyed people?
(b) Who is the youngest among the surveyed people?
Answer: (a) The maximum height of the bar corresponds to Toby. So, Toby is the eldest among the surveyed people.
(b) The minimum height of the bar corresponds to David. So, David is the youngest among the surveyed people.
Q7. The data for favourite animal of 80 people was recorded as shown. Draw a bar chart of this data.
(a)Draw a bar chart of this data.
(b) Find the number of people who like both Kangaroo and Giraffe.
Answer: (a) Number of people and name of the animals are represented on the vertical and horizontal axes respectively.
25 people like Kangaroo. So a vertical bar of height 25 units is made along Kangaroo.
Similarly, other numbers are represented using vertical bars.
(b) The number of people who like both Kangaroo and Giraffe can be found by adding 25 and 14.
25 + 14 = 39
Q8. In Cape Town, the number of cars sold during a particular week was as follows:
Monday: 80, Tuesday: 70
Wednesday: 90, Thursday: 60
Friday: 70, Saturday: 40
Prepare a pictograph of the cars sold using a symbol of car representing 10 cars and answer the following questions:
(a) On which day the maximum number of cars were sold?
(b) How many pictures of cars will represent the number of cars sold on Thursday?
Answer: Pictograph of the cars sold using a symbol of car is given below:
(a) The maximum number of cars was sold on Wednesday.
(b) Six pictures of cars will represent the number of cars sold on Thursday.
Q9. Observe the following bar graph, showing the marks scored by Jacob in the annual examination in different subjects:
Answer the following questions:
(i) What is the scale of this bar graph?
(ii) In which subject Jacob obtained maximum marks?
(iii) In which subject she obtained minimum marks?
Answer: (i) Scale of the given bar graph is:
1 unit length = 10 marks obtained
(ii) Jacob obtained maximum marks in Mathematics.
(iii) Jacob obtained minimum marks in Art.
Q10. In a school, the number of students in different classes are as follows:
Answer: The pictograph for the given information is given below:
Q11. Observe the following pictograph which shows the number of ice cream cones sold by school canteen during a week.
i) When was the minimum number of ice cream cones sold?
ii) When was the maximum number of ice cream cones sold?
iii) What is the ratio of the number of ice cream cones sold on Saturday to the number of ice cream cones sold on Wednesday?
Answer: i) The minimum number of ice cream cones was sold on Thursday.
ii) The maximum number of ice cream cones was sold on Tuesday.
iii) The number of ice cream sold on Saturday = 2 x 4
= 8
The number of ice cream sold on Wednesday = 2 x 6
= 12
The required ratio = 8 : 12 = 2 : 3
Q12. The number of persons in various age (in years) groups in a town is given in the following table:
Draw a bar graph to represent the above information and answer the following questions (take 1 unit height = 20, 000 people):
Which age groups have same population?
Answer: The bar graph of given information is given below:
Age groups 30-44 and 45-59 have same population.
Related Study Material on Extramarks
- Important Questions Class 8 Maths Chapter 1 A Square and A Cube
- Important Questions Class 8 Maths Chapter 2 Power Play
- Important Questions Class 8 Maths Chapter 3 A Story of Numbers
- Important Questions Class 8 Maths Chapter 4 Quadrilaterals
- Important Questions Class 8 Maths Chapter 5 Number Play
- Important Questions Class 8 Maths Chapter 6 We Distribute, Yet Things Multiply
- Important Questions Class 8 Maths Chapter 7 Proportional Reasoning-1
- Important Questions Class 8 Maths Part 2 Chapter 1 Fractions in Disguise
- Important Questions Class 8 Maths Part 2 Chapter 2 The Baudhayana-Pythagoras Theorem
- Important Questions Class 8 Maths Part 2 Chapter 3 Proportional Reasoning-2
- Important Questions Class 8 Maths Part 2 Chapter 4 Exploring Some Geometric Themes
- Important Questions Class 8 Maths Part 2 Chapter 6 Algebra Play
- Important Questions Class 8 Maths Part 2 Chapter 7 Area
Q.1 Express 3Â x 10-7 in usual form.
Marks:1
Ans
Q.2
Marks:3
Ans
Q.3 Find x such that (-2)x+1 × (-2)5 = (-2)7.
Marks:2
Ans
(-2)x + 1 + 5 = (-2)7 ⇒ (-2)x + 6 = (-2)7
On both the sides powers have the same base different from 1 and -1, their exponents must be equal.
∴ x + 6 = 7
â x = 7 â6 = 1
Q.4 What is the standard form of 0.000561?
Marks:1
Ans [ 2050625 ]
Q.5
a-1
b-2
c-3
d-4
Marks:1
Ans [ 2050842 ]
CBSE Class 8 Maths Important Questions
FAQs (Frequently Asked Questions)
Tales by Dots and Lines Class 8 is about mean, median, dot plots, spreadsheets, line graphs, infographics, and activity strips. It uses real examples like heights, weights, rainfall, marks, sleep, and routines.
Mean = Sum of observations / Number of observations. For 3 and 7, mean = 10 / 2 = 5.
Median is the middle value after arranging observations in order. For an even number of observations, take the mean of the two middle values.
A dot plot shows observations as dots on a number line. It helps identify repeated values, spread, clusters, missing values, and the balance point.
A line graph shows how a value changes over time. It is useful for temperature, rainfall, prices, launches, sleep duration, sunrise, and moonrise.