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q3 + 2336 is an algebraic expression which cannot be simplified.
coefficient of quartile deviation is = (q3-q1)/(q3+q1)
(q3-q1)/2
The semi interquartile range is a measure for spread or dispersion. To find it you have to subtract the first quartile from Q3 and divide that by 2, (Q3 - Q1)/2
q3-q2+2q-2 = (q-1)(q2+2) = (q-1)(q+2.5i)(q-2.5i)