Answer: Triangle weighting graphs are mainly found in data analysis, which generally consists of three sets of diagonal lines, with each set representing one thing, i.e., a triangular mesh representing the distribution of a certain object across the three dimensions. Going from the respective top to the bottom, the distribution rate goes down from 100% to down. That is, a triangular mesh is used to represent the distribution of a given object across the three dimensions. There is no explicit data in the graph, only some letters, and it is important to be clear about what these letters represent, because the letters may be detached from the specific options in the question, and if they do not correspond correctly, points will be lost. Mesh graph looks complicated on the surface, but it does not have complex calculations, as long as you master its characteristics, it is easy to come up with the answer.　Example A survey company carried out a sample survey on the main leisure methods during the Golden Week with citizens of different age groups as the target respondents. The triangles below represent the proportion of citizens of different ages among those who take one of the five types of leisure. The apex of the triangle represents 100%, and the corresponding baseline represents 0. A represents traveling, B represents surfing the internet, C represents meeting with friends, D represents reading books and relaxing, and E represents going to the park with parents. Simply put, for each indicator, the larger the value of the point the further out the value is, and the smaller the value is the further in the point the value is, e.g., to take the value between 0-100%, the above chart shows the 3 standardized points to divide the radius into 4 segments, and then the radius is divided into 4 segments. "divided into 4 sections, that from the" center "to the outermost endpoints, the value is 0, 25%, 50%, 75%, 100%. If you want to find the weight of the number of middle-aged and elderly people in the "reading and leisure" activities, that is, "100% of middle-aged and elderly people" as the apex, to the side parallel to the apex to make a parallel line, D for reading and leisure, accounting for 25% of the number of middle-aged and elderly people.　　A triangular weighting diagram is used to count the percentage of each of the three statistical populations in a statistical quantity containing all three populations. Although some candidates may not be familiar with the triangular weighting diagram, but the triangular weighting diagram in the reading as long as you can strictly follow the "find the vertex, find the right side, make parallel lines, reading" four steps, you can read accurately.