# Statistics Helper - Definitions

## Definitions

Below is a simple table, that will clarify the definitions for statistical words.

Type Instructions
Median The median is the number that is halfway into the set. To find the median, the data should be arranged in order from least to greatest. If there is an even number of items in the data set, then the median is found by taking the mean (average) of the two middlemost numbers.
Mean The mean is the average of a set of numbers. To find the mean of a data set, add up all of the numbers in the set, and then divide that total by the number of numbers in the set.
Range The Range is the difference between the lowest and highest values. Example: In {4, 6, 9, 3, 7} the lowest value is 3, and the highest is 9. So the range is 9 − 3 = 6.
Upper Quartile The Upper Quartile, UQ, is the middle of the upper 50% of the data.
Lower Quartile The Lower Quartile, LQ, is the middle of the lower 50% of data.
Inter-Quartile Range The Inter Quartile Range, IQR, is the