Final answer:
The median of the math test scores is 87, calculated by ordering the scores and finding the average of the two middle values since there's an even number of scores.
Step-by-step explanation:
To find the median of the given set of math test scores, you must first arrange the scores in ascending order: 65, 79, 80, 87, 87, 90, 95, 99. Since there is an even number of scores (8 in total), the median will be the average of the fourth and fifth scores in this ordered list. So, the median is (87 + 87) / 2, which equals 87.