NCERT Class 7 Mathematics Solutions: Chapter 3 –Data Handling Exercise 3.1 Part 1
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1. Find the range of heights of any ten students of your class.
Answer:
Sr. No.  Name of students  Height (in feet) 
1  Gunjan 

2  Aditi 

3  Nikhil 

4  Akhil 

5  Riya 

6  Akshat 

7  Abhishek 

8  Mayank 

9  Rahul 

10  Ayush 

Table title: Given 10 students of class
Table description: Give the range of heights of any ten students of class
Range: Highest height lowest height
2. Organize the following marks in a class assessment, in a tabular form:
.
(i) Which number is the highest?
(ii) Which number of the lowest?
(iii) What is the range of the lowest?
(iv) Find the arithmetic mean?
Answer:
Table title: Table shows the marks in a class assessment
Table description: Table shows the marks in a class assessment
(i) Height number
(ii) Lowest number
(iii) Range
(iv)
Sum of all the observations
Total number of observations
Arithmetic mean