Directions: In the following bar diagram, the number of history books and geography books sold by six different book sellers in a certain time has been given. Study the bar diagram carefully to answer the questions.
What is the average number of history books sold by all book sellers taken together?
20
22
24
26
Answer: (c) 24Solution: Total number of books sold by all book sellers = 144 Total number of book sellers = 6, then $$ Average = \frac{144}{6} $$ $$ = 24 \ Books $$
By what percent the number of history books sold by book seller E is more than that of book seller D?
What is the average of the number of geography books sold by book sellers B, C and F together?
20.7
25.2
32.5
35.3
Answer: (a) 20.7Solution: Total number of geography books sold by B, C and F together = 62 Number of book sellers = 3 (B, C and F), then $$ Average = \frac{62}{3} $$ $$ = 20.7 \ Books $$
What is the respective ratio between the number of history books sold by book seller D and that of geography books sold by book seller C?