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There is no need to lose your rag!It is the inter-quartile range.
coefficient of quartile deviation is = (q3-q1)/(q3+q1)
Quartiles have nothing to be "solved", but they can be "found" if that's what you mean...
The inter-quartile range.
The value of any element in the third quartile will be greater than the value of any element in the first quartile. But both quartiles will have exactly the same number of elements in them: 250.