The standard deviation measures:
✓ Correct Answer: Option B
SD = √(Σ(xi−x̄)²/n). Higher SD = more spread. For normal distributions, 68% of data within 1 SD of mean.
SD = √(Σ(xi−x̄)²/n). Higher SD = more spread. For normal distributions, 68% of data within 1 SD of mean.