Question

The quartile deviation from the following observations is
$10,18,20,28,15,17,22,25,29,32,34$

• A. $8$
• B. $6$
• C. $10$
• D. $5$

Answer 1

The correct option is B $6$

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 .

In the given series, 10, 15,17,18,20,22,25,28,29,32,34

Q₁= 17 and Q₃=29

Therefore, Quartile deviation = (Q₃-Q₁) /2

= (29-17)/2

= 12/2

= 6