AP Psychologymediummcq1 pt
In a normal distribution, approximately what percentage of scores fall within one standard deviation of the mean?
A.68%
B.50%
C.95%
D.100%
Explanation
Core Concept
The 68–95–99.7 rule: about 68% within ±1 SD, 95% within ±2, and 99.7% within ±3 standard deviations.
Correct Answer
A68%
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