Answer:
Here are nine numbers that have a mean and median of 9:
1, 1, 1, 7, 9, 9, 9, 11, 11
In this set of numbers, the mean (average) is (1 + 1 + 1 + 7 + 9 + 9 + 9 + 11 + 11) / 9 = 9, and the median (middle value when the numbers are arranged in ascending order) is also 9.