Ex.3.3 Q3 Data Handling - NCERT Maths Class 7

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Question

Number of children in six different classes is given below. Represent the data on a bar graph.

Class

Fifth

Sixth

Seventh

Eighth

Ninth

Tenth

Number of Children

\(135\)

\(120\)

\(95\)

\(100\)

\(90\)

\(80\)

  1. How would you choose a scale?
  2. Answer the following questions:

(i) Which class has the maximum number of children? And minimum?

(ii) Find the ratio of students of class sixth to the students of class eight?

Text Solution

What is known?

Number of children in different classes.

Reasoning: 

We have to draw the graph by using the data.

Steps: 

a) Scale on y-axis is \(1\) unit \(= 10\) children

b)

(i)

  • Fifth class has maximum number of children i.e. \(135\) 
  • Tenth class has the minimum number of children i.e. \(80\)

(ii)

Number of students in class sixth \(=\) \(120\)

Number of students in class eighth \(=\) \(100\)

\[\begin{align} \text{Ratio }&=\frac{\left( \begin{align} & \text{Number of students} \\ & \text{in class sixth} \\ \end{align} \right)}{\left( \begin{align} & \text{Number of students} \\ & \text{in class eighth} \\ \end{align} \right)} \\ & =\frac{120}{100} \\ & =\frac{6}{5} \\ & =6:5 \end{align}\]

  
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