4 The back-to-back stem-and-leaf diagram shows the values taken by two variables \(A\) and \(B\).
| \(A\) | | \(B\) | \multirow{3}{*}{(4)} |
| 310 | 15 | 1335 | |
| 41 | 16 | 2234457778 | |
| 833 | 17 | 01333466799 | (11) |
| 988655432110 | 18 | 247 | (3) |
| 99886542 | 19 | 15 | (2) |
| 98710 | 20 | 4 | (1) |
Key: \(4 | 16 | 7\) means \(A = 0.164\) and \(B = 0.167\).
- Find the median and the interquartile range for variable \(A\).
- You are given that, for variable \(B\), the median is 0.171 , the upper quartile is 0.179 and the lower quartile is 0.164 . Draw box-and-whisker plots for \(A\) and \(B\) in a single diagram on graph paper.