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As median divides an arranged series int...

As median divides an arranged series into two equal parts, in similar way quartile divides an arranged series in 4 equal part. For ungrouped frequency distribution formula of finding ith quartile = `Q ={i.((N+1)/4)}^(th)` term, i = 1, 2, 3.term, i = 1, 2, 3. Quartile deviation : half of difference between upper quartile & lower quartile. Quartie deviation (Q.D)=`1/2(Q_3-Q_1)` Coefficient of quartile deviation =` ((Q_3-Q_1)/(Q_3+Q_1))`. If 1, 2, 3, 4, 5, 6, 7, are numbers then `Q_1 & Q_3`, are respectively

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