$Z-Score$

Z-Score

Z-score of a value, percentile and normal probabilities, value from z and calculation from a sample.

What to find:

Z-score from the mean and standard deviation

Z-score from a sample

Value from a z-score

Numbers separated by spaces, semicolons or new lines; fractions as 1/6, decimals as 2.5.

A z-score shows how many standard deviations a value is from the mean.

z = (x − μ) / σ

At z = 0 the value equals the mean. About 68% of normally distributed values lie within |z| < 1 and about 95% within |z| < 2.

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