And this area is going to be greater than or equal to zero and less than or equal to 100%. When I eyeball it right over here, it looks like it's about 40% of the entire area under the curve. So just eyeballing it, I would say roughly 40% of my data falls into this interval. If I were to ask you what percentage of the data is greater than three, well then you would be looking at this area, and it looks like it is about 50%, but once again, I am estimating it. But you can start to see how even with estimation, a density curve could be useful. In the real world, statisticians will often have tables that might represent the information for the density curve. They might have computer programs or some type of automated tool, and there are also well-known density curves, the famous bell curve that we will study later on where there's a lot of precise data and a lot of tools to exactly figure out the areas.