This table summarizes shares of the U.S. wireless telephone market in 2011. To summarize these percentages together in a pie chart, what needs to be added? What would happen if we were to generate a...

This table summarizes shares of the U.S. wireless telephone market in 2011. To summarize these percentages together in a pie chart, what needs to be added?

What would happen if we were to generate a bar chart for a column that measures the amount spent by the last 200 customers at a convenience store?