Calculation of range and median along with Box-and-whisker plots and Cumulative frequency tables are effective ways to compare distributions and to summarise their characteristics.

What is the range of the following data?

6, 3, 12, 14, 8, 21

15

21

18

What is the median of the following data?

3, 5, 6, 9, 2, 6, 1

9

5

6

7, 5, 2, 3, 4, 9

2.5

4.5

What is the interquartile range from the following data?

20, 11, 28, 14, 19, 13, 23

3

2

10

What is the interquartile range from the following cumulative frequency diagram?

0.3 m

0.62 m

0.12 m

30.5 cm

20.5 cm

6.5 cm

What is the median from this box-and-whisker plot?

14

19

What is the range on this box-and-whisker plot?

12

What is the lower quartile of this box-and-whisker diagram?

What is the interquartile range from this box-plot?