PSLE The bar graph shows the number of storybooks read by a class from August to November. The number of storybooks read in August is not shown.
- What was the percentage decrease in the number of storybooks read from October to November?
- The average number of books read in a month from August to November was 70. How many books did the class read in August?
(a)
One interval = 1 u
Decrease in the number of storybook reads from October to November
= 10 u - 7 u
= 3 u
Percentage increase in the number of storybooks read from from October to November
=
310 x 100%
= 30%
(b)
Total number of storybooks read from August to November
= 4 x 70
= 280
Number of storybooks read from September to November
= 60 + 100 + 70
= 230
Number of storybooks read in August
= 280 - 230
= 50
Answer(s): (a) 30%; (b) 50