12.04 Horizontal bar graphs and vertical column graphs

Which section has the least members?

Choose the section with least of dots.

Looking at the dot plot, percussion has the least dots.

So the correct answer is option A.

How many people are in the band?

Count all the dots for each section, and then add the results together.

Each dot represent 1 person.

So there are 23\,people in the band.

How many more people are there in the Strings section than the Brass section?

Subtract the number of dots for the brass section from the number of dots for the strings section.

Each dot represent 1 person.

So there are 3 more people in the Strings section than in the Brass section.

Create a column graph which shows the number of badges by student.

Use the table to know how high each column should go.

Note that the ticks on the vertical axis go up by 5s not 1s.

When drawing each column, the tick for the name should be in the center of the column. Each column should be the same width. There should be gaps between each column.

From the table, Derek sold 70 badges. So the column above Derek's name should go up to 70. We can use the same method for the rest of the columns.

Which student sold the same number of badges as Tara?

Look for another column which has the same height as Tara's column.

Looking at the column graph, we can see that William's column has the same height as Tara's.

So the correct answer is option C.

How many points in total were earned by Tari and Emily?

Add the points that the two columns reach.

Tari's bar goes up to 10 so she earnt 10 points. Emily's bar goes up to 8 so she earnt 8 points.

How many more points did Nayan earn than Ivan?

Subtract Ivan's points from Nayan's.

Nayan's bar goes up to 16 so he earnt 16 points. Ivan's bar goes up to 12 so he earnt 12 points.

So Nayan earned 4 more points than Ivan.

Complete the frequency table with the information.

Use the colour key to find the number of men and women that like each genre by comparing the heights of each column to the number on the vertical axis.

We can see that the darker blue column is for women, while the lighter blue column is for men. Using this, we can find the number that matches the top of each column.

For Drama, the dark blue column goes up to 45 and the light blue column goes up to 10. So 45 women and 10 men like drama. We can use the same process to complete the table.

Which genre had the same number of men and women select it as their favourite?

Find the genre with the same number in the completed frequency table from part (a).

From the table, the same number of men and women selected Comedy as their favourite.