NCERT Solutions for Class 8 Math Chapter 5 - Data Handling

Question 1:

If we change the position of any of the bars of a bar graph, would it change the information being conveyed? Why?

Question 2:

Draw an appropriate graph to represent the given information.

Question 3:

Question 4:

Percentage wins in ODI by 8 top cricket teams.

Question 5:

A group of students were asked to say which animal they would like most to have as a pet. The results are given below:
dog, cat, cat, fish, cat, rabbit, dog, cat, rabbit,
dog, cat, dog, dog, dog, cat, cow, fish, rabbit,
dog, cat, dog, cat, cat, dog, rabbit, cat, fish, dog.
Make a frequency distribution table for the same.

Question 6:

Study the following distribution table and answer the questions given below:
Frequency distribution of daily income of 550 workers of a factory?

(i) What is the size of the class intervals?
(ii) Which class has the highest frequency?
(iii) Which class has the lowest frequency?
(iv) What is the upper limit of the class interval 250–275?
(v) Which two classes have the same frequency?

Question 7:

Construct a frequency distribution table for the data on weights (in kg) of 20 students of a class using intervals 30–35, 35–40 and so on.
40, 38, 33, 48, 60, 53, 31, 46, 34, 36, 49, 41, 55, 49, 65, 42, 44, 47, 38, 39.

Question 8:

Observe the histogram (fig.) and answer the questions given below:

(i) What information is being given by the histogram?
(ii) Which group contains maximum girls?
(iii) How many girls have a height of 145 cm and more?
(iv) If we divide the girls into the following three categories, how many would there be in each?
150 cm and more $\to$ Group – A
140 cm to less than 150 cm $\to$ Group – B
Less than 140 cm $\to$ Group – C.

Question 9:

For which of these would you use a histogram to show the data?
(a) The number of letters for different areas in a postman’s bag.
(b) The height of competitors in an athletics meet.
(c) The number of cassettes produced by 5 companies.
(d) The number of passengers boarding trains from 7: 00 a.m. to 7: 00 p.m. at a station.
Give reasons for each.

Question 10:

The shoppers who come to a departmental store are marked as: Man (M), Woman (W), Boy (B) or Girl (G). The following list gives the shoppers who came during the first hour in the morning:
W W W G B W W M G G M M W W W W G B M W B G G M W W M M W W W M W B W G M W W W W G W M M W W M W G W M G W M M B G G W
Make a frequency distribution table using tally marks. Draw a bar graph to illustrate it.

Question 11:

The weekly wages (in ₹) of 30 workers in a factory are:
830, 835, 890, 810, 835, 836, 869, 845, 898, 890, 820, 860, 832, 833, 855, 845, 804, 808, 812, 840, 885, 835, 835, 836, 878, 840, 868, 890, 806, 840.
Using tally marks make a frequency table
with intervals as 800–810, 810–820 and so on.

Question 12:

The weekly wages (in ₹) of 30 workers in a factory are:
830, 835, 890, 810, 835, 836, 869, 845, 898, 890, 820, 860, 832, 833, 855, 845, 804, 808, 812, 840, 885, 835, 835, 836, 878, 840, 868, 890, 806, 840.
Draw a frequency table with intervals as 800–810, 810–820 and so on, and a histogram then answer the following questions:
(i) Which group has the maximum number of workers?
(ii) How many workers earn ₹850 and more?
(iii) How many workers earn less than ₹850?

Question 13:

The number of hours for which students of a particular class watched television during holidays is shown through the given graph.
Answer the following.
(i) For how many hours did the maximum number of students watch TV?
(ii) How many students watched TV for less than 4 hours?
(iii) How many students spent more than 5 hours in watching TV?

Question 14:

Each of the following pie charts gives you a different piece of information about your class. Find the fraction of the circle representing each of these information.

Question 15:

Answer the following questions based on the pie-chart as given in the figure.

(i) Which type of programmes are viewed the most?
(ii) Which two types of programmes have number of viewers equal to those watching sports channels?

Question 16:

Draw a pie chart of the data given below: The time spent by a child during a day.
Sleep $\to$ 8 hours
School $\to$ 6 hours
Home work $\to$ 4 hours
Play $\to$ 4 hours
Others $\to$ 2 hours

Question 17:

Which form of graph would be appropriate to display the following data:
Production of food grains of a state.

Question 18:

Choice of food for a group of people.

Question 19:

The daily income of a group of a factory workers.

Question 20:

A survey was made to find the type of music that a certain group of young people liked in a city. Adjoing pic chart shows the findings of this survey.

From this pie chart, answer the following:
(i) If 20 people liked classical music, how many young people were surveyed?
(ii) Which type of music is liked by the maximum number of people?
(iii) If a cassette company were to make 1000 CD’s, how many of each type would they make?

Question 21:

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

(i) Which season got the most votes?
(ii) Find the central angle of each sector.
(iii) Draw a pie chart to show this information.

Question 22:

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

Question 23:

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

(Hint: For 540 marks, the central angle = 360°. So, for 105 marks what is the central angle.)
(ii) How many more marks were obtained by the student in Mathematics than in Hindi?
(iii) Examine whether the sum of the marks obtained in Social Science and Mathematics is more than that in Science and Hindi.
(Hint: Just study the central angles.)

Question 24:

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

Question 25:

If you try to start a scooter, what are the possible outcomes?

Question 26:

When a die is thrown, what are the six possible outcomes?

Question 27:

When you spin the wheel shown, what are the possible outcomes? (Fig.) List them.

(Outcome here means the sector at which the pointer stops.)

Question 28:

You have a bag with five identical balls of different colours and you are to pull out (draw) a ball without looking at it, list the outcomes you would get (Fig.)

Question 29:

In throwing a die:
Does the first player have a greater chance of getting a six?

Question 30:

In throwing a die:
Would the player who played after him have a lesser chance of getting a six?

Question 31:

In throwing a die:
Suppose the second player got a six. Does it mean that third player would not have a chance of getting a six?

Question 32:

Suppose you spin the wheel

Question 33:

List the outcomes you can see in these experiments.
(a) Spinning a wheel.

(b) Tossing two coins together.

Question 34:

When a die is thrown, list the outcomes of an event of getting:
(i) (a) a prime number.
(b) not a prime number
(ii) (a) a number greater than 5.
(b) a number not greater than 5.

Question 35:

Find the
(a) Probability of the pointer stopping on D

in

(b) Probability of getting an ace from a well shuffled deck of 52 playing cards.
(c) Probability of getting a red apple from the given figure. (See figure below)

Question 36:

Numbers 1 to 10 are written on ten separate slips (one number on one slip), kept in a box and mixed well. One slip is chosen from the box without looking into it. What is the probability of:
(i) getting a number 6?
(ii) getting a number less than 6?
(iii) getting a number greater than 6?
(iv) getting a 1-digit number?

Question 37:

If you have a spinning wheel with 3 green sectors, 1 blue sector and 1 red sector, What is the probability of getting a green sector?
What is the probability of getting a non blue sector?