Ononot — For a dataset with first quartile Q1 = 30 and third quartile

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For a dataset with first quartile $Q_1 = 30$ and third quartile $Q_3 = 80$ , the quartile deviation (semi-IQR) is calculated as $\text{QD} = \frac{Q_3 - Q_1}{2}$ . What is the quartile deviation?