Normal distribution

Also written: bell curve, Gaussian

The bell-shaped curve: most values sit near the average, and fewer the further you go.

Other terms from the same lesson

• central limit theorem: Averages of many random values form a bell curve, even when the values themselves don't.
• z-score: How many standard deviations a value sits above or below the average. A z-score of 2 is unusually high.