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10 cards from this deck
A score indicating how far a value is from the mean.
Mean = Sum of scores / Number of scores.
Above-average performance compared to peers.
z = (x - μ) / σ, where x is the score.
Mean = 3100 / 50 = 62.
Use: σ = √(Σx²/n - (Σx/n)²).
1.6 standard deviations above the average score.
Aptitude: 0.3, Skills: 1.125; better on skills test.
Below-average performance compared to peers.
They allow fair comparisons across different tests.
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