The interquartile range is another measure of spread, except that it has the added advantage of not being affected by large outlying values. In order to calculate this value we must first ...

Sampling data - Intermediate & Higher tier - WJEC Cumulative frequency – Intermediate & Higher tier - WJEC Averages and range - WJEC Discussing results - WJEC Mean, median and mode ...

Arithmetic Mean: (a.k.a. mean) the sum of a set of numbers divided by the number of numbers in the set. Average: see "Central Tendency." Box-and-Whisker Plot: see "Box Plot." Box-Plot: graphical ...