Ononot — A histogram is created for a continuous variable X with N=10

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A histogram is created for a continuous variable $X$ with $N=1000$ observations. Using the Freedman-Diaconis rule, $h = \frac{2 \cdot IQR}{\sqrt[3]{N}}$ . Given that $Q_1 = 20$ and $Q_3 = 60$ , calculate the optimal bin width $h$ .