PSLE The bar graph shows the number of storybooks read by a class from June to September. The number of storybooks read in June is not shown.
- What was the percentage decrease in the number of storybooks read from August to September?
- The average number of books read in a month from June to September was 70. How many books did the class read in June?
(a)
One interval = 1 u
Decrease in the number of storybook reads from August to September
= 10 u - 8 u
= 2 u
Percentage increase in the number of storybooks read from from August to September
=
210 x 100%
= 20%
(b)
Total number of storybooks read from June to September
= 4 x 70
= 280
Number of storybooks read from July to September
= 70 + 100 + 80
= 250
Number of storybooks read in June
= 280 - 250
= 30
Answer(s): (a) 20%; (b) 30