(i)[3]
Find the median together with the interquartile range for group A.
(ii)[3]
Draw box-and-whisker plots for groups A and B on the grid.
Mathematics 9709 · AS & A Level · Sampling and estimation
Sampling and estimation — practice question
The back-to-back stem-and-leaf diagram below presents reaction times, in seconds, from an experiment with two groups of people, A and B. Key: $5 \mid 22 \mid 6$ represents a reaction time of $0.225$ seconds for A and $0.226$ seconds for B.