MathLiveZ-score
This converts a value from a normal distribution with mean μ and standard deviation σ into a standard normal value Z with mean 0 and standard deviation 1. It is used to look up probabilities in a standard normal table.
Z = \frac{X - \mu}{\sigma}What the symbols mean
| observed value from a normal distribution | |
| mean of the distribution | |
| standard deviation of the distribution (positive) | |
| standardized value (z-score), dimensionless |
About this formula
- FieldStatistics
- TopicProbability distributions
- LevelHigh school
- Also calledstandard score, standardizing a normal variable, z-score formula, standardization formula, standard normal variable, normal distribution standardization
- SourceWikidata Q1263029
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