Question

Asked Jan 22, 2020

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Explain why the percentage of all possible observations of a normally distributed variable that lie within two standard deviations to either side of the mean equals the area under the standard normal curve between -2 and 2.

Step 1

The *x* values delimiting the interval within two standard deviations from the mean are µ–2σ and µ+2σ.

The formula for *z*-score is,

Step 2

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