The mode is a statistical term for the value that occurs most frequently in a set of numbers. Learn about the difference between the mean, median, and mode.

How to calculate Standard Deviation in Excel The Standard Deviation is a term used in statistics. The term describes how much the numbers if a set of data vary from the mean.

Handy guide: Find tips, lesson ideas, and free resources for beefing up instruction in statistics and geometry. Quiz: Test your knowledge of math concepts, and then see how U.S. students fared.