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A data set has lower quartile 20 and upper quartile 30. Calculate the coefficient of quartile deviation.

Competition practiceStatistics

A0.4
B0.2
C5
D10

Step-by-Step Solution

Coefficient of QD

= \frac{Q _{3} - Q _{1}}{Q _{3} + Q _{1}} = \frac{10}{50} = 0.2

. (5 is the quartile deviation itself; 0.4 divides by 25.)

Answer: B) 0.2

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