Answer:
16
Explanation:
The median is simply the middle number when all of the quiz scores are written in order.
11, 12, 16, 16, 17, 18, 20
Moving from the outside in, you can see that 16 falls directly in the middle of the seven scores; there are three scores lower and three scores higher. Therefore, 16 is the median.
It does not matter that 16 is listed twice, they are still counted separately.
Good luck!