The median is the value located in the middle or the middle value, in order to find it, first, we have to order the set of numbers like this:
76, 78, 83, 87, 90, 90.
When the number of values is an even number, we just have to take the two values in the middle, sum them up and divide the result by 2, like this:
in this case, the middle values are 83 and 87
Then, the median score equals 85