```Question 4259
While I don't see the relevance of graphs in your question, here is how you would find the mean, mode, and median of a set of data (numbers).

1)  You find the mean (average) of a set of numbers by adding up the numbers and then dividing the sum (total) by the number of numbers that you added. In this problem you would add: 7+15+3+25+33+15+21  When you have the total, you would then divide it by 7.  This would be the mean.

2) You find the mode (most frequent number) of a set of data (numbers) by identifying the most-frequently occuring number in the set. In this set, there is only one number that appears more than once so this number would be the mode of this set.

3) You find the median (middle) of a set of data (numbers) by first arranging the numbers in order, from smallest to largest.  Then you identify the number in the middle of the set. In this set, which has an odd number of numbers (9)there is only one number in the middle.  When the set consists of an even number of numbers, then you would find the middle two numbers, add them and divide by two.```