From the graph, find how many people own a maximum of 20 books in all.
All the bars in the graph represent a set of 20 books, it can be simplified in the following manner.
20 books = 8 people
40 books = 14 people
60 books = 5 people
80 books = 6 people
100 books = 2 people
So, the first bar in the graph tells us that 8 people have maximum of 20 books.