Estimate interquartile range (IQR) from a bar chart using Q1 and median.
\( \begin{array}{l}\text{Bar chart: tallest bar 25, shortest 9, median = 18, Q1 = 13. Find IQR.}\end{array} \)
Choose one option:
Double-check Q1, median, and Q3 estimation.
Use symmetry to estimate Q3 if not given.
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