To obtain the median first you need to put the scores in order. For even scores, the median in the average of the middle two scores. When there is duplication around the median then the medians needs to be interpolated . A difficulty arises because these two scores are both 12. Indeed the are a total of 4 scores of 12.
Interpolation There are four scores in the interval containing the median.
If we do this we will find that the average between the 25th and 26th score is actually 12.25 Don't worry if you don't get this. I left out the details and will explain them in class. The Mode This is the easiest one. The mode is the score which occurs the most. The Mean is affected by the values of scores in your distribution and is always pulled toward extreme scores.