The area under a normal distribution curve between ±1 standard deviation is approximately:
✓ Correct Answer: Option B
In a normal distribution: ~68% within ±1 SD, ~95% within ±2 SD, ~99.7% within ±3 SD.
In a normal distribution: ~68% within ±1 SD, ~95% within ±2 SD, ~99.7% within ±3 SD.