Question

The times spent answering a question on DFM by 31 pupils are shown below.

1 1
1
3
3
3
5 5
6 6 6 6 9 9 10 10
10 11 11 12 12 13 14 14
15 16 17 17 19 19 20
Find the interquartile range.

Answer 1

9

Explanation:

IQR or interquartile-range is calculated by subtracting the Q3 - Q1. Quartile 1 is 14, and Quartile 3 is 5. Thus, 14 - 5 = 9.

(what does DFM mean though?)