Final answer:
Graphs and numerical summaries describe key features of quantitative variables in descriptive statistics.
Step-by-step explanation:
Graphs and numerical summaries describe key features of quantitative variables in descriptive statistics. Graphs visually display the data, while numerical summaries provide quantitative measures. Examples of graphs used for quantitative variables include histograms, line graphs, and bar graphs, which represent the distribution, trend, and relationship between variables. Numerical summaries, such as measures of central tendency (mean, median, and mode) and measures of dispersion (range, variance, and standard deviation), provide numerical values that describe the data.