1. **Problem:** Which of the following can be obtained from any box-and-whisker diagram? Options: A. Mean, B. Mode, C. Standard deviation, D. Inter-quartile range. 2. **Explanation:** A box-and-whisker diagram (box plot) visually shows the minimum, lower quartile (Q1), median (Q2), upper quartile (Q3), and maximum of a data set. 3. **Important rules:** - The mean is the average and is not directly shown in a box plot. - The mode is the most frequent value and is not shown in a box plot. - The standard deviation measures spread but is not shown in a box plot. - The inter-quartile range (IQR) is the difference between Q3 and Q1 and is represented by the length of the box. 4. **Conclusion:** The only value that can be obtained from any box-and-whisker diagram is the inter-quartile range. **Final answer:** D. Inter-quartile range