Given: 2,3,4,5,6,8,9,10Calc : Q1, Q2, and IQRExcel gives Q1=3.75, Q3=8.25  IQR=4.5TI 36XPro and TI89 give : QI=3.5  Q3=8.5  IQR=5another calc byKhan using i(n+1/4=3.25  Q3=2(n+1)/4=8.75  IQR=5.5So, which is correct...?...and which one do i use...?Wikipedia using formula based on Median which might be correctanother site some other related formulanot all IQR calculators on web yield same resultvery confusingwhat do we do here...and what will be correct formula and its referencethank youKen
Correct Answer For Calculation of Q1, Q3, and IQR
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