Question

Which measure of dispersion is least affected by extreme values?

• A. Range
• B. Mean deviation
• C. Standard deviation
• D. Quartile deviation

Answer 1

The correct option is D Quartile deviation

Quartile deviation divides the series into four equal parts and measures the distance average between the third and the first quartile. The first quartile is denoted as Q₁ and the third quartile is denoted as Q₃ . Therefore, quartile deviation is not affected by the extreme values of the series.