Statistics

Values that are used to describe the center of a set of data are mean, median, and mode. The mean is the average. The median is the middle number. The mode is the number that occurs most often.

The range, mean absolute deviation, and interquartile range are all ways to measure the variability for a set of data.

The range measures how spread out the data is. To find the range, subtract the smallest value from the largest value in a set of data.
The mean absolute deviation (MAD) is the average distance of each data value from the mean.

The interquartile range (IQR) is the difference between the first and third quartiles.

A stem-and-leaf plot, histogram, line graph, and frequency table are all graphic representations of data. Graphs can be used to analyze the data and find measures of center and variability. Graphical displays of data can also be helpful when comparing two or more sets of data.

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