Question

Why we are taking exact lower limit in quartile deviation?

Answer 1

The Quartile Deviation doesn't take into account the extreme points of the distribution. Thus, the dispersion or the spread of only the central 50% data is considered. If the scale of the data is changed, the Qd also changes in the same ratio.

Answer 2

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HERE IS UR ANSWER

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✔✔Lower limit provides exact and better data result.

✔✔So,it is preferred .