z-score for x = 72, μ = 80, σ = 4
A negative z-score puts the value two standard deviations below the mean.
Solution
- Given x = 72, μ = 80, σ = 4
- Formula z = (x − μ) / σ
- Substitute z = (72 − 80) / 4 = -2
- Interpretation 2 standard deviations below the mean
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