Grubbs's test

Grubbs's test is a way to find out if a number in a list or a set of numbers is an outlier. An outlier is a number that is much bigger or smaller than the other numbers.

To use Grubbs's test, first you need to pick a number in the list or set. Then you divide the chosen number by the average of the numbers in the list or set. If the result is more than a certain amount, then the chosen number is an outlier.