Answer:
9
Step-by-step explanation:
9, 18, 12, 9, 13, 22, 8, 23, 16, 17
Mode is the number that appears most often
Listing numbers in order from smallest to largest helps to see how many of each number
8,9,9, 12, 13,16,17 ,18, 22, 23,
We see the number 9 appears most often
