Answer:
Any number greater than 10; 11, 12, 15, 20, 100...etc
Explanation:
Order the data from least to greatest and strikethrough numbers on each side until you reach the middle 1 or 2 numbers. In this case there are 9 numbers, so the middle number is our median.
8, 8, 8, 8, 10, v, 18, 18, 18
the variable v can be many numbers, but in order for the median to be 10, v must be a number greater than 10. If v = 11, the median is 10. Likewise, if v = 100000, the median is still 10 because it is the middle of the set.