The histogram below shows the average dollars spent on coffee per month.

The histogram below shows the average dollars spent on coffee per month.

Figure 1: The graph is a histogram that shows the average dollars spent on coffee per month. The horizontal x-axis shows dollars spent on coffee with bins ranging from 5 to 55 in increments of 5. The vertical y-axis shows the height of each bin, which represents frequency and ranges from 0 to 45 in increments of 5. The data is summarized in the table below. All data are approximate.

Question: What do the numbers on the x-axis show?