The student demonstrates consistent and correct use of mathematical notation, symbols, and terminology. However, key terms and variables such as f(x) and L(x) are not clearly defined, and the student should define all variables presented in the formulas. The introduction effectively describes the main concepts of Gini index and Lorenz curve. Mathematical representations like formulae, diagrams, tables, charts, graphs, and models are appropriately used. All calculations and data presentations are well-explained. However, the degree of accuracy for rounded values is not stated, and the labeling of graphs, tables, and diagrams needs to be revised for clarity and uniformity.
