PSLE The bar graph shows the number of storybooks read by a class from September to December. The number of storybooks read in December is not shown.
- What was the percentage increase in the number of storybooks read from September to October?
- The average number of books read in a month from September to December was 55. How many books did the class read in December?
(a)
One interval = 1 u
Increase in the number of storybooks read from September to October
= 6 u - 4 u
= 2 u
Percentage increase in the number of storybooks read from September to October
=
24 x 100%
= 50%
(b)
Total number of storybooks read from September to December
= 4 x 55
= 220
Number of storybooks read from September to November
= 40 + 60 + 40
= 140
Number of storybooks read in December
= 220 - 140
= 80
Answer(s): (a) 50%; (b) 80