The x's represent how many times that number is in the data set. For example, 20 is in the data set 3 times, so there are 3 20's in the set. The mode is the number that shows up the most. To find the median, write the numbers in order from least to greatest. Then find the number that is in the middle. If there are an even number of numbers, you have to add the two in the middle together and divide by two to find the median.
