Normal distribution calculator

Set the mean and standard deviation, then two values: the area between them, the probability, is shaded and worked out, with the z-scores.

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Questions students ask

What is a z-score?

How many standard deviations a value is from the mean: z = (x − μ)/σ.

What is the 68–95–99.7 rule?

In a normal distribution about 68% of values lie within one standard deviation of the mean, 95% within two and 99.7% within three.

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