NCERT Solutions Class 6 Mathematics Chapter 9 Data Handling

Q.1: In a Mathematics test, the following marks were obtained by 40 students. Arrange these marks in a table using tally marks.

(a) Find how many students obtained marks equal to or more than 7. 
(b) How many students obtained marks below 4?

Ans : By observing the marks scored by 40 students in the test, we can construct the 
table as follows. 

(a) The students who obtained their marks equal to or more than 7 are the students who 
obtained their marks as either of 7, 8, and 9. Hence, number of these students — 5 + 4 + 3= 12 
(b) The students who obtained their marks below 4 are the students who 
obtained their marks as either of 1, 2, and 3.
Hence, number of these students = 2 + 3 + 3 = 8 

Q.2: 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, Caddo, Ladoo, Barfi, Rasgulla, 
Rasgulla, Jalebi, Rasgulla, Ladoo, Rasgulla, Jalebi, Ladoo. 
(a) Arrange the names of sweets in a table using tally marks. 
(b) Which sweet is preferred by most of the students?

Ans : By observing the choices of sweets of 30 students, we can construct the table as below. 
(a)

(b) Ladoo is the most preferred sweet as the most number of students (i.e., 11) prefer Ladoo. 

Q.3: Catherine threw a dice 40 times and noted the number appearing each time as shown 
below: 

Make a table and enter the data using tally marks. Find the number that appeared. 
(a) The minimum number of times 
(b) The maximum number of times 
(c) Find those numbers that appear an equal number of times.

Ans : 
(a) The number which appeared the minimum number Of times (i.e., 4 times) iS 4. 
(b) The number which appeared the maximum number Of times (i.e., 11 times) is 5. 
(c) 1 and 6 are the numbers which appear for the same number Of times (i.e., 7 times). 

Q.4: Following pictograph shows the number of tractors in five villages. 

observe the pictograph and answer the following questions. 
(i) Which village has the minimum number Of tractors? 
(ii) Which village has the maximum number of tractors? 
(iii) How many more tractors village C has as compared to village B. 
(iv) What is the total number of tractors in all the five villages?

Ans : (i) Village D has the minimum number of tractors, i.e., only 3 tractors. 
(ii) Village C has the maximum number of tractors, i.e., 8 tractors. 
(iii) Number of more tractors that village C has = 8 - 5 = 3 
(iv) Total number Of tractors in all these villages = 6 + 5 + 8 + 3 + 6 = 28 

Q.5: The number of girl students in each class of a co-educational middle school is depicted by the pictograph: 

Observe this pictograph and answer the following questions: 
(a) which 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? 
(c) How many girls are there in Class VII?

Ans : From the above table, it can be concluded that in classes I, II, Ill, IV, V ,VI, VII, VIII, there are 24, 18, 20, 14, 10 , 16, 12, 6 girls respectively. 
(a) Class VIII has the minimum number of girls, i.e., only 6 girls. 
(b) NO. In class V and VI, there are 10 and 16 girls respectively. Clearly, the number Of girls is more in class VI than that in class V. 
(c) There are 12 girls in class VII