A) 14.5
B) 5
C) 9
D) 4.5
Correct Answer: D
Solution :
The given data in ascending order of magnitude is 7, 10, 12, 15, 17, 19, 25 Here \[{{Q}_{1}}=\text{size of }{{\left( \frac{n+1}{4} \right)}^{th}}\] item = size of 2nd item = 10 \[{{Q}_{3}}=\text{size of }{{\left( \frac{3(n+1)}{4} \right)}^{th}}\] item = size of 6th item = 19 Then Q.D.\[=\frac{{{Q}_{3}}-{{Q}_{1}}}{2}=\frac{19-10}{2}=4.5\].
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