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OpenStudy (anonymous):
convert 11 to a z score when a set of data items is normally distributed with a mean of 20 and a standard deviation of 4.
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OpenStudy (anonymous):
Three standard deviations below the mean might be a z score of -3.
OpenStudy (kropot72):
\[z=\frac{X-\mu}{\sigma}=\frac{11-20}{4}=You\ can\ work\ this\ out\]
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