# Normal Distribution, Z-Score, Modified Z-Score, and MAD: The Statistical Tools of Anomaly Detection

> Source: https://sukruyusufkaya.com/en/learn/anomali-tespiti/normal-dagilim-zscore-mad
> Updated: 2026-05-13T13:08:08.402Z
> Category: Anomali Tespiti
> Module: Module 2: Statistical Foundations
**TLDR:** Meaning of normal distribution for anomaly detection; z-score formula, intuition, and limits; modified z-score and MAD (Median Absolute Deviation) as outlier-robust alternatives; from-scratch Python implementation.