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Z-Score Calculator
How many standard deviations from the mean?
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Results
Z-Score
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Percentile (โ)
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How to use the Z-Score Calculator
z = (x โ ฮผ) รท ฯ. We also convert to an approximate percentile via the normal CDF.
Frequently Asked Questions
Two standard deviations above average โ roughly the 97.7th percentile of a normal distribution.