Given x ̅ = 60, s = 8.Find the z-score value of raw score 78 up to two decimal places
z=x−xˉs=78−608=2.25.z=\cfrac{x-\bar x}{s}=\cfrac{78-60}{8}=2.25.z=sx−xˉ=878−60=2.25.
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