Calculateur de Score Standard
Convertissez vos résultats en score standard normalisé.
Score Z
1.00
Points Above Mean10.0
Standard Deviations from Mean1.00
Z-Score vs Your Score
Formule
How to Calculate a Z-Score
A z-score measures how many standard deviations a score is from the mean.
Formula
Z = (Score - Mean) / Standard Deviation
Exemple Résolu
A student scores 85 in a class with mean 75 and standard deviation 10.
- 01Z-score = (85 - 75) / 10 = 1.0
- 02Points above mean = 85 - 75 = 10
- 03The student is 1.0 standard deviations above the mean.
Questions Fréquentes
What is a good z-score?
A z-score of 1.0 or higher means you are above average. A z-score of 2.0+ means you are in roughly the top 2.5% of the class.
Can a z-score be negative?
Yes, a negative z-score means your score is below the class average.
How does z-score relate to percentile?
A z-score of 0 is the 50th percentile, 1.0 is about the 84th percentile, and 2.0 is about the 97.7th percentile.