In a data sample, the purpose of quartile deviation is a way to measure data dispersion instead of using the range. The quartile deviation is found by subtracting the lower quartile from the upper quartile, and dividing this result by two.
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What is coefficient of quartile deviation?
mean deviation =(4/5)quartile deviation
coefficient of quartile deviation: (Q3-Q1)/(Q3+Q1)
7,8,9 q.d?
6,6,9,5,8,9,6,7,8,8,6,5,5,6,8,5,7,7,8,6,5,9,10,14,5,8,5,8,10,10,7,7,7,8,6,6,7,5,7,8,8,5,6,6,7,7,7,6,6,9