Question

The bar graph corresponding to the following frequency distribution table is

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

The frequency table represents the number of students in a class having certain eye color.

To plot a bar graph with the given data, eye color is plotted on the horizontal axis, then the vertical axis represents the number of students.

Step 1: Observe the minimum and maximum value from the number of student columns and make a corresponding division in the vertical axis.

Here. the minimum is 7 and the maximum is 30.

Hence, we make 3 equal divisions of 10 units and plot up to 30 units as shown in the figure.

Step 2: For black eye color, draw a corresponding rectangle of height 30 units.

Step 3: For blue eye color, draw a corresponding rectangle of height 21 units.

To plot 21, we estimate that 21 is relatively more than 20 but less than 25. Hence, by approximation, we plot 21 as a little higher than 20 units.

Step 4: For green eye color, draw a corresponding rectangle of height 7 units.

We need to plot 7 as an approximation.

$\Rightarrow$ We know that 5 < 7 < 10

$\therefore$ We plot 7 as a little higher than 5 but less than 10.