PSLE The bar graph shows the number of storybooks read by a class from May to August. The number of storybooks read in May is not shown.
- What was the percentage decrease in the number of storybooks read from July to August?
- The average number of books read in a month from May to August was 60. How many books did the class read in May?
(a)
One interval = 1 u
Decrease in the number of storybook reads from July to August
= 5 u - 4 u
= 1 u
Percentage increase in the number of storybooks read from from July to August
=
15 x 100%
= 20%
(b)
Total number of storybooks read from May to August
= 4 x 60
= 240
Number of storybooks read from June to August
= 90 + 50 + 40
= 180
Number of storybooks read in May
= 240 - 180
= 60
Answer(s): (a) 20%; (b) 60