Description: Sal interprets a bar graph. Created by Sal Khan. At Hogwarts, there are four houses: Gryffindor, Hufflepuff, Ravenclaw, and Slytherin. The bar chart below shows the number of house points that each house received today. And so, if we look at Hufflepuff's bar, it looks like they have 3 points scored today.*Teacher Advisor is 100% free.