USA snapshot presented a bar graph depicting business travelers’ impression of wait times in airport security lines over the past 12 months. Statistics were derived from Travel Industry Association of American Business Traveler Survey of 2034 respondents. Could this be a probability distribution? Why or why not.

Worse – 49%
Same 40%
Better – 11%

The bar graph could be a probability distribution, but the three categories would not. The worse and better categories do not indicate how much worse or better the times are.