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Chapter 9: Data Handling

    Introduction

    Recording Data

    Organisation of Data

    Pictograph

    Interpretation of a Pictograph

    Exercise 9.1

    What Have We Discussed ?

    Enhanced Curriculum Support

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Chapter 9: Data Handling > Exercise 9.1

Exercise 9.1

In a Mathematics test, the following marks were obtained by 40 students. Arrange these marks in a table using tally marks.

8   1   3   7   6   5   5   4   4

2   4   9   5   3   7   1   6   5

2   7   7   3   8   4   2   8

9   5   8   6   7   4   5   6

9   6   4   4   6   6

Marks obtainedTally marksNumber of students
1
2
3
4
5
6
7
8
9

(a) Find how many students obtained marks equal to or more than 7.

Students with marks equal to or more than 7 =

(b) How many students obtained marks below 4?

Students with marks below 4 =

Following is the choice of sweets of 30 students of Class VI.

Ladoo, Barfi, Ladoo, Jalebi, Ladoo, Rasgulla, Jalebi, Ladoo, Barfi, Rasgulla, Ladoo, Jalebi, Jalebi, Rasgulla, Ladoo, Rasgulla, Jalebi, Ladoo, Rasgulla, Ladoo, Ladoo, Barfi, Rasgulla, Rasgulla, Jalebi, Rasgulla, Ladoo, Rasgulla, Jalebi, Ladoo.

(a) Arrange the names of sweets in a table using tally marks.

SweetsTally marksNumber of students
Ladoo
Barfi
Jalebi
Rasgulla

(b) Which sweet is preferred by most of the students?

Catherine threw a dice 40 times and noted the number appearing each time as shown below.

1    3    5    6    6    3    5    4    1    6

2    5    3    4    6    1    5    5    6    1   

5    1    6    2    3    5    2    4    1    5

Make a table and enter the data using tally marks. Find the number that appeared.

Number on the diceTally marksNumber of times
1
2
3
4
5
6

(a) The minimum number of times.

The number appeared times which is the minimum.

(b) The maximum number of times

The number appeared times which is the maximum.

(c) Find those numbers that appear an equal number of times.

The number and appear for the same number of times.

Following pictograph shows the number of tractors in five villages.

VillageNumber of tractors - 1 Tractor
Village A
Village B
Village C
Village D
Village E

Observe the pictograph and answer the following questions.

(i) Which village has the minimum number of tractors?

Village has the minimum number of tractors, i.e., .

(ii) Which village has the maximum number of tractors?

Village has the maximum number of tractors, i.e., .

(iii) How many more tractors village C has as compared to village B.

Village C has tractors more than that of the village B.

(iv) What is the total number of tractors in all the five villages?

Total number of tractors in all the villages is .

The number of girl students in each class of a co-educational middle school is depicted by the pictograph.

ClassesNumber of girl students - 4 Girls
I
II
III
IV
V
VI
VII
VIII

Observe this pictograph and answer the following questions.

(a) Which class has the minimum number of girl students?

Class has the minimum number of girl students

(b) Is the number of girls in Class VI less than the number of girls in Class V?

Number of girls in Class VI = × 4 = and number of girls in Class V = × 4 =

So, number of girl students in Class VI is not less than that of in Class V.

(c) How many girls are there in Class VII?

Class VII = × 4 =

The sale of electric bulbs on different days of a week is shown below.

DaysNumber of electric bulbs - 2 Bulbs
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

Observe the pictograph and answer the following questions :

(a) How many bulbs were sold on Friday?

Friday = × 2 =

(b) On which day were the maximum number of bulbs sold?

On , the number of bulbs sold = × 2 =

(c) On which of the days same number of bulbs were sold?

On and , the same number of bulbs were sold, i.e., × 2 =

(d) On which of the days minimum number of bulbs were sold?

and , i.e., × 2 =

(e) If one big carton can hold 9 bulbs. How many cartons were needed in the given week?

Total number of bulbs sold in a week =

Number of cartons needed = (43 × ) ÷ = ÷ = cartons.

In a village six fruit merchants sold the following number of fruit baskets in a particular season.

Name of fruit merchantsNumber of fruit baskets - 100 Fruit Baskets
Rahmin
Lakhanpal
Anwar
Martin
Ranjit singh
Joseph

Observe this pictograph and answer the following questions:

(a) Which merchant sold the maximum number of baskets?

sold the maximum number of fruit baskets, i.e., × 100 =

(b) How many fruit baskets were sold by Anwar?

Anwar sold × 100 = baskets

(c) The merchants who have sold 600 or more number of baskets are planning to buy a godown for the next season. Can you name them?

, and have sold 600 or more fruit baskets and planning to buy a godown.