There are 24 values written. To find the mean, we add them up: They add to 1941. Then we divide that by 24:

1941/24 = 80.88 (Mean)

The median is the middle value; So, we have to put them in order. When we do that, we find that the 12th value is 84 and the 13th value is 85; so the median would be the value between them (or 84.5)