Set up the x and y axis to have particular variables. Add up the frequency of a certain variable and mark that on your graph. Each variable gets its own ‘bar.’ For example say that there are three ages on your x axis; ages 23, 24 and 25. Lets say you took a survey of the ages of your classmates and there were 5 people that were 23 in your class, 2 that were 24 and 7 that are 25. Simply make a bar for each age group and you are done.