Values above the mean have positive z-scores, while values below the mean have negative z-scores. The z-score, also referred to as standard score, z-value, and normal score, among other things, is a dimensionless quantity that is used to indicate the signed, fractional, number of standard deviations by which an event is above the mean value being measured. Use this calculator to find the probability (area P in the diagram) between two z-scores. This is the equivalent of referencing a z-table. Please provide any one value to convert between z-score and probability. Use this calculator to compute the z-score of a normal distribution. Home / math / z-score calculator Z-score Calculator
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