Answer:
6 - 10 is the best choice.
Step-by-step explanation:
given:
19, 11, 29, 6, 10, 16, 21, 15, 22, 13, 9, 17, 26, 18, 7
arrange least to greatest:
6, 7, 9, 10, 11, 13, 15, 16, 17, 18, 19, 21, 22, 26, 29
insert intervals:
6, 7, 9 || 10, 11, 13|| 15, 16, 17 || 18, 19, 21 || 22, 26, 29