PSLE The bar graph shows the number of storybooks read by a class from September to December. The number of storybooks read in September is not shown.
- What was the percentage decrease in the number of storybooks read from November to December?
- The average number of books read in a month from September to December was 70. How many books did the class read in September?
(a)
One interval = 1 u
Decrease in the number of storybook reads from November to December
= 10 u - 3 u
= 7 u
Percentage increase in the number of storybooks read from from November to December
=
710 x 100%
= 70%
(b)
Total number of storybooks read from September to December
= 4 x 70
= 280
Number of storybooks read from October to December
= 90 + 100 + 30
= 220
Number of storybooks read in September
= 280 - 220
= 60
Answer(s): (a) 70%; (b) 60