Mathematics · Statistics

For a normal distribution or general asymmetric distributions, what is the mathematical relationship between the Quartile Deviation (QD) and the Standard Deviation (SD)?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1QD value is exactly twice the value of SD
2QD value is always equal to SD value
3QD value is smaller than SD value (approximately 0.6745 times SD in normal distribution)✓
4QD value is always larger than SD value

Correct answer

QD value is smaller than SD value (approximately 0.6745 times SD in normal distribution)

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