Find out quartile deviation and the coefficient of quartile deviation of the following data:

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Find out quartile deviation and the coefficient of quartile deviation of the following data:
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Sir I have a one doubt .I can see many videos the Q1 =n/4 and some teach including your pervious video same this model but
groped video you tell Q=n/4 then this video why you write Q=n+1/4 many people teach Q1=n+1/4 what is the correct way apply the Q1 .please reply the question sir

SNNS