Z-Score Calculator

Find how many standard deviations a value is from the mean.

CALCULATE

Z = (x - μ) / σ

Positive Z: above mean. Negative Z: below mean.

A Z-score of 0 = the mean. Z=1: top 15.9%. Z=2: top 2.3%. Z=3: top 0.1%. Used in grading curves, quality control, and hypothesis testing.

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