PSLE The bar graph shows the number of storybooks read by a class from July to October. The number of storybooks read in July is not shown.
- What was the percentage decrease in the number of storybooks read from September to October?
- The average number of books read in a month from July to October was 80. How many books did the class read in July?
(a)
One interval = 1 u
Decrease in the number of storybook reads from September to October
= 10 u - 9 u
= 1 u
Percentage increase in the number of storybooks read from from September to October
=
110 x 100%
= 10%
(b)
Total number of storybooks read from July to October
= 4 x 80
= 320
Number of storybooks read from August to October
= 90 + 100 + 90
= 280
Number of storybooks read in July
= 320 - 280
= 40
Answer(s): (a) 10%; (b) 40