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| statistics | The branch of mathematics concerned with data, or numerical information. |
| data | Numerical information. |
| graph | A display that provides a pictorial representation of data. |
| pictograph | A graph that uses symbols to represent information. |
| circle graph | A graph that represents data by the size of the sectors. |
| bar graph | A graph that represents data by the height of the bars. |
| broken-line graph | A graph that represents data by the position of the lines and shows trends and comparisons. |
| histogram | A bar graph in which the width of each bar corresponds to a range of numbers called a class interval. |
| class interval | Range of numbers represented by the width of a bar on a histogram. |
| class frequency | The number of occurrences of data in a class interval on a histogram; represented by the height of each bar. |
| frequency polygon | A graph that displays information similarly to a histogram. A dot is placed above the center of each class interval at a height corresponding to that class's frequency. |
| class midpoint | The center of a class interval in a frequency polygon. |
| mean | The sum of all values divided by the number of those values ; also known as the average value. |
| median | The value that separates a list of values in such a way that there is the same number of values below as above it. |
| mode | In a set of numbers, the value that occurs most frequenly. |
| range | In a set of numbers, the difference between the largest and smallest values. |
| first quartile | In a set of numbers, the number below which one-quarter of the data lie. |
| third quartile | In a set of numbers, the number above which one-quarter of the data lie. |
| interquartile range | The difference between the third quartile and the first quartile. |
| box-and-whiskers plot | A graph that shows the smallest value in a set of numbers, the first quartile, the median, the third quartile, and the greatest value. |
