Final answer:
The median for the given data set is 23.5
Step-by-step explanation:
To find the median for the given data set, we need to put the values in order from smallest to largest.
The data set in order is 20, 20, 20, 21, 22, 22, 22, 22, 23, 23, 24, 24, 25, 25, 25, 26. Since there are 16 values, the median will be the average of the two middle values, which are 23 and 24. Adding them together and dividing by 2 gives us a median of 23.5.
Therefore, the correct answer is option (c) 22.5.