Respuesta :

 5 is left lower quartile and 11.5 is upper quartile. 11.5 minues 5 equals 6.5.

Answer:

6.5

Step-by-step explanation:

1, 2, 5, 5, 7, 8, 10, 11, 11, 12, 15, 23

Median: 9

Lower quartile: 5

Upper quartile: 11.5

Interquartile range: 11.5 - 5 = 6.5