Z-Score → Percentile
Z-score 0 = 50th percentile (mean). Z = 1 = 84th percentile. Z = −1 = 16th percentile.
Used in IQ tests, exam scaling, and statistical inference.
Worked examples
Z = 0: 50th percentile.
Z = 1.96: 97.5th percentile (one tail of 95% CI).
Frequently asked questions
How do I compute it?
Use the cumulative normal distribution (CDF). Tables or software (Python scipy.stats, Excel NORM.S.DIST).