# Concept derivation guides

299 concept teaching guides, separate from the 36,000 individual question derivations.

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Concept guide



## [Standard-normal symmetry with explicit named facts](/en/derivations/derivation-mko-standard-normal-distribution-01/?from=%2Fen%2Fderivations%2F%3Fq%3Dmko-standard-normal-distribution)

Separate Gaussian prerequisites from derived CDF symmetry.

Standard normal distribution

derivation-mko-standard-normal-distribution-01





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