Cognitive Scaffold

Preparing your thinking workspace

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MENTAL MODEL · M6355

Normal Distribution

Normal Distribution
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

A bell-shaped curve. Most data cluster around the mean, with extreme values being rare. It applies to variables that are sums of independent factors, such as height and IQ.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

The mediocre world. In domains following a normal distribution (e.g., manufacturing yield), the mean represents everything, and extreme values can be ignored. However, in domains following a power law (e.g., wealth, influence), the mean is meaningless, and extreme values dominate. It is crucial to distinguish which world you are in.

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Anchor fast decisions

The accumulation of many independent small factors, by the central limit theorem, approaches a bell-shaped distribution. The mean determines the location, and the variance determines the spread.

MINIMUM ACTION

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Normal_distributionZH · Explicit
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