z-score for x = 85, μ = 70, σ = 10
Standardize a single value to standard-deviation units.
Solution
- Given x = 85, μ = 70, σ = 10
- Formula z = (x − μ) / σ
- Substitute z = (85 − 70) / 10 = 1.5
- Interpretation 1.5 standard deviations above the mean
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