If the quartile deviation and its co-efficient of a series are 3 and 0.25 respectively, find Q1 and Q3
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Q.D. = Q3 – Q1 / 2
So, to calculate Quartile deviation, you need to first find out Q1 then the second step is to find Q3 and then take a difference of both and the final step is to divide by 2. This is one of the best methods of dispersion for open-ended data.
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