Ononot — In a histogram representing the distribution of a variable X

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Data Visualizationhard

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In a histogram representing the distribution of a variable $X$ , we use the Freedman-Diaconis rule to choose bin width $w = 2 \cdot IQR(X) \cdot n^{-1/3}$ . If the interquartile range is $10$ and there are $64$ observations, what is the optimal bin width $w$ ?