General Education Development (GED) Practice Exam

The correct choice is focused on fundamental concepts in statistics, namely mean, median, mode, and range. These measures are essential for summarizing and interpreting data, making them crucial components of statistical analysis.

Mean refers to the average of a set of numbers, calculated by adding all values together and dividing by the total number of values. Median indicates the middle value in a sorted data set, providing insight into the data's distribution, especially when dealing with skewed data. Mode represents the most frequently occurring number in a data set, and can give useful information about trends within the data. Lastly, range shows the difference between the highest and lowest values in a dataset, giving a sense of the data's spread.

While the other options contain useful mathematical concepts, they do not encompass the breadth of statistical measures commonly tested in the Mathematical Reasoning section. For example, percentages and ratios are important but serve a different purpose in statistical analysis. Graphs and charts are valuable for data representation and visualization but are not specific statistical measures. Calculating standard deviation is certainly an important statistical concept, but it is more advanced and not as foundational as the four concepts mentioned. Thus, the focus on mean, median, mode, and range captures the basics of statistical reasoning necessary for