Normal Distribution (3-Sigma Rule)
正态分布（3σ原则 / 68-95-99.7准则）
Theoretical Identity Description:
The 3-Sigma (68-95-99.7) rule for a normal distribution with mean 'μ' and standard deviation 'σ'. It describes the percentage of data falling within one, two, and three standard deviations from the mean.
Rigorous Derivation Tree
Foundational identity statement defined under standard mathematical conditions.
Targeted algebraic evaluation and parameter substitution.
CSCA Exam Triggers & Traps
Apply whenever an exam question presents conditions matching this canonical identity.
Be vigilant of domain boundaries, sign flips, and degenerate boundary condition cases.
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