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For the data set {2, 5, 8, 10}, you have found that
\(Q_1 = 2.75\)
and
\(Q_3 = 9.5\)
when using the "n+1" method (and slightly different if using the "n-1" method.) Therefore,
\begin{equation*} IQR = 9.5 - 2.75 = 6.75. \end{equation*}
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