Buying music online Young people are more likely than older folk to buy music online. Here are the percent's of people in several age groups who bought music online in $2006$:

(a) Explain why it is not correct to use a pie chart to display these data.

(b) Make a bar graph of the data. Be sure to label your axes and title your graph.

The percentage of buying music online based on the age group is-

The distribution of a category variable is displayed using pie charts and bar graphs. Any set of quantities measured in the same units can be compared using bar graphs. It's a good idea to ask yourself, "What do I see?" when looking at any graph.

A pie chart is a form of a graph that uses slices to illustrate the relative size of the data being presented. The sum of the percentages must equal $100$ percent in order to create the pie chart.

The sum of percentages in this case is:

Sum of percentages= $(24+21+20+16+10+3+1)\%=95\%$

Because the total does not equal $100$ percent. As a result, a pie chart is inappropriate in this situation.

The bar chart can be constructed as: