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 Related Terms
 Frequency Table:  A table for organizing a set of data that shows the number of times each item or number appears.
Frequency: The number of times an item, number, or event occurs in a set of data.
Stem-and-Leaf Plot: A graphical method used to represent ordered numerical data. Once the data are ordered, the stem and the leaves are determined. Typically, the stem is all but the last digit of each data point and the leaf is that last digit.
Box and Whisker Plot: A diagram that summarizes data using the median, the upper and lower quartiles, and the extreme values (outliers).
Median: The number in the middle of a set of data when the data are arranged in order. When there are two middle numbers, the median is their mean.
Mode: The number that occurs most frequently in a set of numbers.
Mean: The sum of the numbers in a set of data divided by the number of pieces of data. This is what we usually call "average." Also called the arithmetic mean.
Histogram: A way of displaying numeric data using horizontal or vertical bars so that the height or the length of the bars indicates the frequency.